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You are here: Science Cafe / 2008 / December

Archive for month: December, 2008

How to make a shrunken head

30 Dec 2008 / 2 Comments / in Chemistry/by Carl

Making a shrunken head for Halloween is fun and it only takes a few items to get started. To create a shrunken head you need just a few items. Gather up an apple, granny smith, red delicious, whatever, pretty much any apple will work. The basic steps for making a shrunken head from an apple are: remove the skin, coat with lemon juice, carve features, soak in saltwater, let shrink for 2 weeks, decorate with optional features. See it’s so easy anyone can do it. Plus if you really mess up you can always eat the apple!

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FAQ about Hermit Crabs

28 Dec 2008 / 8 Comments / in Hermit Crabs/by Carl

Here are some frequently asked questions about Hermit Crabs.

What can I feed my crab?
Pretty much anything because they are omnivores and scavengers. Here is a small list of what they will eat.

  • popcorn
  • cheerios
  • shrimp
  • sardines
  • turkey
  • chicken
  • salmon
  • fish flakes
  • spirulina
  • oatmeal
  • granola
  • nuts (almonds, pecans, walnuts, pistachios, peanuts, cashews)
  • peanut butter
  • wood
  • leaves
  • scrambled eggs
  • organic baby food
  • freeze dried shrimp
  • naturally dried red seaweed algae
  • chickpeas (a.k.a. garbanzo beans)
  • dulse (seaweed)
  • alaria (seaweed)
  • hamburger
  • coconut
  • strawberry
  • banana
  • dried brine shrimp

What CAN’T I feed my crab?

  • Aloe vera (interferes with potassium absorption)
  • Dill
  • Garlic
  • Geranium
  • Ivy (of any kind)
  • Onion
  • Peppermint
  • Pine, cedar wood or needles
  • Rosemary
  • Thyme
  • Citrus (leaves and branches are to be avoided because they are part of the evergreen family. The fruit is fine.)

What type of shells do I give my crabs?
It is recommended that you offer you’re hermit crabs natural unpainted shells to choose from. The painted shells can chip and the paint is unhealthy for the hermit crabs.

Where can I buy shells?
You can buy your shells from a pet store or you can buy shells from a craft store. If you buy your shells in a craft store you should boil the shells before you put them in the tank for the crabs. The shells should boil rapidly in de-chlorinated water for 10 minutes to kill any bacteria that may be in the shells. Make sure the shells are completely cool before you put them in the tank.

How can I tell if my crab is getting ready to molt?
The pre-molt symptoms (PMS) are:

  • Digging
  • Consuming large amounts salt or fresh water
  • Soaking in the salt or fresh water dish
  • Cloudy eyes
  • Ashy looking exoskeleton
  • Lethargic (inactive)
  • Spilling water to dampen the sand

How do I take care of a molting crab?
Normally when hermit crabs molt they will bury themselves deep within the sand. You should never dig up your crab. You should leave the crab under the sand until it is ready to come back to the surface after it has molted. On rare occasions a crab will attempt to molt on the surface of the sand. If this happens it is recommended that you isolate the crab from the other crabs in the tank. This is because other crabs may bother or even try to eat another crab that is molting. You can cut a 2-liter bottle in half and put it over the crab. Make sure that you include water and food for the isolated crab. You can also move the crab to a second tank until it has finished molting. The crab will shed its exoskeleton and then eat it. The old exoskeleton contains nutrients that helps the new exoskeleton to harden. The crab will then return to normal activities like climbing and walking around the tank.

How long does it take for my crab to molt?
The length of time depends on the size of your crab. Small crabs will take a couple of weeks while large crabs will take up to three months.

How much sand do I need for my crab?
The amount of sand depends on the size of your crab. The sand depth can range from 2 inches for small crabs (1/2 inch or less in length) to 10 inches for very large crabs (three inches in length).

What is that sound?
Hermit crabs actually make noises. They sound like a cross between a cricket chirping, a frog croaking, and a squeaky hinge on a door. It is unclear how the crab makes this noise, some think that there are two plates of exoskeleton inside the crab that rub together. Hermit crabs make this noise when they are agitated. So if you hear your hermit crab sing it isn’t happy!

I need help. I just got my

Submitted by Anonymous (not verified) on Sun, 09/23/2007 – 00:49.

I need help. I just got my first hermit crab and he has dug himself into the bark chips and hasn’t come out for two days now. Is this normal? Should I dig him up (actually I have no idea where in the crabitat he is now) or leave him to do whatever it is he’s doing. Please help me so that I don’t kill Pepe!

I would leave Pepe under the

Submitted by Carl on Mon, 09/24/2007 – 08:01.

I would leave Pepe under the bark chips for now. Crabs will sometimes deal with stress (like moving into a new home) by burying themselves under the sand. Remember that Hermit Crabs are night-time creatures and Pepe may be coming out in the middle of the night when you are asleep. You might try putting a few bits of food out and then watch the next morning to see if Pepe has been out eating in the middle of the night.It may take a while before you see Pepe out and about in the middle of the day. Make sure you keep him stocked with food and water and watch for him in the evenings and early mornings. Once Pepe is more comfortable with his new home you will probably see him more often.

I have a 10 Gallon tank that

Submitted by Megan (not verified) on Tue, 10/16/2007 – 21:11.

I have a 10 Gallon tank that I’ve had Aloe Vera plants in. I recently added Hermit crabs because I was told it was safe. Is it not? i would like to have living plants in with them. The tank at first was just suppose to be for plants, but i liked the idea of hermit crabs. So far all they’ve done is dig. should i remove all the plants? What ones are safe then?
Help! advice from too many people!
thx

Megan, While Hermit Crabs do

Submitted by Lacey on Thu, 10/18/2007 – 10:01.

Megan,

While Hermit Crabs do enjoy having different things in their habitat, aloe vera plants may not be the best choice. Hermit Crabs will eat anything that is in their tank including the plants. Aloe Vera plants are toxic to the hermit crabs if they eat them which their invariably will. The aloe vera prevents the hermit crab from absorbing potassium. Here is a link to a site that discusses edible and inedible foods for hermit crabs (www.epicureanhermit.com). Pick a couple of plants that are safe for them to eat, just be prepared to have them shredded since hermit crabs do that to whatever they find in their tank!

I wouldn’t be concerned with the digging behavior because hermit crabs will dig and climb around for fun. Another possibility is that the hermit crab might be getting ready to molt. This is a healthy and normal proccess. Your hermit crab may dissappear for days and then reappear. Also they are most active at night so they may be surfacing when all is dark and quiet.

Good luck with your hermit crabs!

i have a glass tank and my

Submitted by Anonymous (not verified) on Sun, 11/04/2007 – 16:40.

i have a glass tank and my crab dug to the bodem of it am he has been in his shell and i saw it though the glass so i dug him up and his claw is blue and his skin is pink so i put him back in the sand will he live ?

Well I think your crab

Submitted by Lacey on Thu, 11/08/2007 – 17:48.

Well I think your crab either dug down to molt or to de-stress. So putting him back was a good idea. Keep an eye on your hermit crab he may stay down there for a couple of weeks but I wouldn’t dig him up, I would wait until the crab chooses to surface. How much sand do you have in your tank? How big is your hermit crab? The amount of the sand in your tank depends on the size of your little hermie friend. The larger the crab the more sand they need.

I wouldn’t worry about the color differences, the color of hermit crabs depends on the type that you have. The two most common types sold in pet stores are Caribbean Land Hermit Crabs and Ecuadorian Hermit Crabs. Caribbean Hermit Crabs generally have a bluish colored large claw (cheliped) and a red body. These colors can become more brilliant after or during a molt. They need to be buried while they are molting which is why I suggest to leave your crab under the sand until the crab returns to the surface on its own.

What and how do i know if my

Submitted by kati emac (not verified) on Thu, 12/20/2007 – 18:26.

What and how do i know if my hermit crab is having babbies and if it did how would i know because i think mine did because i saw 5 little things that feel and look like a little tiny crabe like rilly small please get back as soon as posible and also if they did do i just leave them a lone until they hatch or what ever thay do.

Hermit Crabs cannot

Submitted by Lacey on Wed, 12/26/2007 – 18:26.

Hermit Crabs cannot reproduce in captivity. They need an ocean nearby in order to complete their life cycle.

I would suspect that those tiny crab-like creatures that you can see are mites. Crabs can get mites sometimes. These are pesky little critters and here is a link to a page that gives tips on how to get rid of them… http://www.hermit-crabs.com/FAQ.html

The best thing you can do is to clean and sterilize the tank. The link above explains how to do that. Good Luck!

Can my hermit crabs have

Submitted by Anonymous (not verified) on Thu, 01/03/2008 – 16:14.

Can my hermit crabs have bamboo in the habitat?

I have or used to have two

Submitted by cannot find my little crab for 3 months (not verified) on Sat, 01/05/2008 – 18:14.

I have or used to have two crabs – one is still alive and climbing, but the other has been missing for about 3 and a half months. They are quite small so I don’t think it takes so long for them to molt. A crab I had before disappeared like this and we found him in the substrate dead. What is the cause of these deaths? Is there a chance that the crab I’m talking about now is still alive?

You may be suprised, but, we

Submitted by amazed (not verified) on Fri, 02/08/2008 – 08:19.

You may be suprised, but, we had a hermit crab disappear, and I found him ALIVE a year later when I busted into a wall when we were remodeling. It was found in the cement block where it was moist enough I guess. I am still mystified that it survived!!!

I curently have 3 herit

Submitted by Anonymous (not verified) on Thu, 02/21/2008 – 20:11.

I curently have 3 herit crabs i had 5 but two of them dug themselves on a hole and i thought it was normal but boy was i wrong.I still don’t know what happened but now i pick it up put it in their food dish then they should start moving if they don’t pick it up and put them in their water dish/sponge and wait and see what happens in 24 hours.And you could also go to your local pet store (i went to petco) and ask them what else to do.

i was checking out the same

Submitted by Anonymous (not verified) on Wed, 03/26/2008 – 22:40.

i was checking out the same thing on a website and they said lucky bamboo is toxic to them but it depends on the bamboo type
bryce

I just brought home 3 hermit

Submitted by Jenny (not verified) on Tue, 04/29/2008 – 10:02.

I just brought home 3 hermit crabs from the sea. Two of them seem ok but one of them keeps coming out of its shell and it just sits there on the sand and looks very weak. I bought them each a new shell to change into when they are ready, but he wont even walk to the new shell. This morning I picked it up to check it and it moved very little. I want to know what is wrong with it? Is it just stressed because of the new habitat? or is it dying? Could it be that he’s going to molt? But, hes not eating and there’s no food bubble stored under his belly… Please help!!! I’m confused and I don’t want them to die!!!

Hello, I bought 3 hermit

Submitted by Anonymous (not verified) on Fri, 05/09/2008 – 23:02.

Hello,

I bought 3 hermit crabs for my young children, but it has been more than I thought. I have been reading the various websites and am learning more and more about how to care for them. The problem is…..I no longer feel like we can take care of them and am trying to find the best way to handle. Does anyone know the best way to do this? Hopefully this does not offend anyone. Please help, I want give them to someone who can properly care for them. Thank you.

I think the problem with

Submitted by Lacey on Fri, 05/16/2008 – 15:32.

I think the problem with your hermit crab is simple. He’s freaked out. Hermit crabs don’t deal well with stress. I would imagine that since he came from the beach he is just super stressed about the change in his environment. The best thing that you can do for him is provide him everything he needs and leave him alone. You can even set up a small isolation tank with just him in it until he is feeling better. Sometimes a hermit crab just need peace and quiet.

You could try some of the

Submitted by Lacey on Fri, 05/16/2008 – 15:34.

You could try some of the various hermit crab websites sometimes you can find a good home in your area for them. You could even try the pet store. If you are lucky you might find an employee that could take them or they might know someone who could.

I would take them from you!

Submitted by Anonymous (not verified) on Thu, 05/29/2008 – 23:08.

I would take them from you! But I doubt we live near by!

hey one of my hermit crabs

Submitted by Anonymous (not verified) on Fri, 05/30/2008 – 17:02.

hey
one of my hermit crabs has come out of its shell, i noticed that it had cum out of its shell in the evening and thought it was just going into a new shell, but it was still out the shell the next morning, now it is behind its water bowl and still not in a shell, i am not sure if its ill or if there is sumthing wrong with it. if u can help me i would appreciate it.

I’ve had my two hermit crabs

Submitted by Anonymous (not verified) on Fri, 06/13/2008 – 00:24.

I’ve had my two hermit crabs for a year now. It seems that the two of them like their home alot, for there has been no claw dropping or anything. However, they are rather large, (about four inches across) and they keep tipping over the drinking water dish. They won’t molt at all, and one only changed shells once. The other hasn’t changed shells. I’ve tried giving them different types of food, but they won’t eat hardly anything. They eat maybe once every two weeks! Why is this? Am I doing something wrong? I followed all the care sheets! Recently, I gave them dried shrimp, which they didn’t eat, and I removed the dish afterwords. The new dish, however, attracted mites. I found them today and plan to clean out the tank tomorrow. Will these mites effect my home? My home, not the crabitat? I have an allergy to some dust mites so I’m really anxious to know.

I just got 2 hermit crabs i

Submitted by amithabha (not verified) on Fri, 06/13/2008 – 01:26.

I just got 2 hermit crabs i got their habitat all set up i put sand on one side and that mossy stuff on he other. I have a climb in water dish so they can bathe and sponge in another and a seperate food dish. I mist the tank everyday. They even have a tree. I think though one of them is singing wondering why they arent happy am i doing something wrong? also should i be adding salt water to both dishes? They are small and i cant find the right shells any suggestions? Help please thanks!

I would like to take them

Submitted by Anonymous (not verified) on Tue, 07/01/2008 – 11:34.

I would like to take them for you. I know its been some time ….Do you still have them and where are you located?

don’t worry, you should

Submitted by krystal (not verified) on Wed, 07/02/2008 – 13:10.

don’t worry, you should probably just leave him there, hermit crabs know what there doing. this is normal for them to do, and he might possibly be molting. if it is a small crab he might stay below the surface for up to a month or so, if it’s a big one it could be even longer. Don’t panic and be prepared to give him the best supply of food and water for when he emerges, because if he is molting, he’ll need his calcium. Another reason for digging themselves below the surface could be because of the temperature. Make sure they’re not too hot or too cold. to do this keep a thermometer nearby and make sure the temperature stays around 20 degrees celcius, give or take about 5 degrees.
i’m sure Pepe will be fine as long as you provide him with the best surroundings.
hope this helped!

Do my Hermit crabs need

Submitted by Anonymous (not verified) on Wed, 07/09/2008 – 14:20.

Do my Hermit crabs need vitamins from the light

i once had the same thing

Submitted by Anonymous (not verified) on Wed, 07/09/2008 – 14:31.

i once had the same thing happen if its been 3 months hes destressing not molting or R.I.P so when ever this happens to me i just clean the tank and secondarly look for the little guy most of the time there still alive

My hermit crab had a baby.

Submitted by Anonymous (not verified) on Mon, 07/28/2008 – 23:41.

My hermit crab had a baby. I have read in may places that they do not reproduce in captivity, but it happened. Both of our hermit crabs died and my son lifted up the shell after his died and inside was a small pink claw. It is very small, but very much alive. It may be unusual, but it happened.

we just recently bought a

Submitted by maria & sam (not verified) on Thu, 07/31/2008 – 15:29.

we just recently bought a hermit crab its a large crabb & since we brought it home it hasnt movedd we took it a bath to get the dirt off we fed it crab cakes & gave it some peanut butter we left it alone & when we checked on it again it was still in the same spot im worried its deppressed what can i do to make my hermit crab more comfortable in its new crabitat??

YES IT IS NORMAL. they do

Submitted by crabber (not verified) on Sun, 08/03/2008 – 22:03.

YES IT IS NORMAL. they do this from time to time. If you dig him up he could possibly die.

LEAVE HIM if you have just

Submitted by MarcusLeeDaG (not verified) on Wed, 08/06/2008 – 22:03.

LEAVE HIM

if you have just recently got him and he has had a change to his substrate he will be molting and do u only have 1 crab they are very social animals and u need at least 2 or 3 since you are unaware of what is happening to your crab i doubt u have researched how to take care of him if you got him from a pet store then whatever they have told you will probably be crap if im honest, please do more research

I got my crab about june 20

Submitted by Anonymous (not verified) on Tue, 08/19/2008 – 19:19.

I got my crab about june 20 somthing and i did all my research on how to take care of it. but im worried that it is not molting. it has burried its self in the sand and i wached it for a day or two and it hasent moved. i know i probably sholdnt but i picked it up and under neath was little brown clumps. What are they? And when i picked it up i also saw that its legs just fell to one side and to the other. my crab sems lifeless and im extremly worried. what do i do?

Your hermit crab is probably

Submitted by Anonymous (not verified) on Thu, 08/21/2008 – 13:08.

Your hermit crab is probably molting. Whatever you do DO NOT DIG HIM UP!!!! It is normal for hermit crabs to molt and it means that your hermit crab is healthy. Make sure you have 3 extra shells in the tank one a little smaller than the one he is in now, one about the same size, and one slightly bigger. Also make sure to provide food and water as needed. Your crab should be done molting as soon as 1 week to as long as 3 weeks. Good luck!!!!!

I think your hemit crab is

Submitted by Anonymous (not verified) on Mon, 08/25/2008 – 18:46.

I think your hemit crab is trying to molt put sand in pepe’s tank and see if he buries himself.

My sister’s hermit crab just

Submitted by Anonymous (not verified) on Thu, 09/04/2008 – 17:52.

My sister’s hermit crab just died after about 2 1/2 years. No other hermit crabs in the tank…she went to clean out the shell that he had climbed out of and a baby was inside. Any clue how this happened?

if you want to get rid of

Submitted by Anonymous (not verified) on Thu, 09/18/2008 – 15:59.

if you want to get rid of them, send just one to this address:
14559 truro parish Cour, VA zip code:20120

hey listen, i think i need a

Submitted by Hermit_Crab_Lover on Thu, 09/18/2008 – 16:30.

hey listen, i think i need a LOT of help with this. i have two hermit crabs, Jenny and Hermy. Hermy is very small, and is NEVER afraid to come out of his shell. JENNY on the other hand, it is rare to see her come out. two nights ago, she came out of her shell and went into a new one, and i went upstaors for 5 minutes, came back down and she had gone back to her old one. i dont use sand, i use specially designed gravel. this may sound mean, but i REALLY want to see them change shells, i would even be glad if they changed shells when i WASN’T looking, so how would i do it?

how small exactly are they

Submitted by gabriel (not verified) on Tue, 09/23/2008 – 09:17.

how small exactly are they because if there way smaller than your pinky finger they just hatched and if you see one again you should pick it up and examine it, but make sure your wearing rubber gloves just incased its deseased! and maybe it is a good idea to leave them alone after you examine it becauseit could be scared and if you keep bothering it, it could die if it gets to stressed.

if your hermit crab is still

Submitted by gabriel (not verified) on Tue, 09/23/2008 – 09:39.

if your hermit crab is still out of its shell and has been out for more than 48 hours it will eventully die and no i didn’t read it of the computer ive experiensed it last night! i have 2 cages a big one and a little one and i now have three hermit crabs so one of my hermit crabs just molted, it was kinda kreepy though cause the exo skeleton was just hanging out and then i see my hermit crab pop out and then im thinkin ok shes fine but i was wrong. so i took both of my babies into the small contaner cause i didn’t want the big hermies to eat the little one that molted so i put the other hermit crab in with cause he wont eat the other one so i went back down stairs to do my home work and then i came back up stairs and i didn’t see him in his shell but he was laying on the sand without his shell! so i called my mom and i was crying like crazy i was so scared and then my mom was looking at him and she said ‘its time’ and i was screaming to god ‘dont take her now shes to young to die!’ but it was time and i guess my other crab missed her to cause he went into her old shell.

well one of my hermit crabs

Submitted by gabriel (not verified) on Tue, 09/23/2008 – 09:57.

well one of my hermit crabs has just died but i still have three of them and one of the three changes shells like crazy and he dosn’t care whos looking so my friend and i were watching him go near a shell so we watched him and eventually he changed shells and it was so cool but now hes justed braging so if you really want to see your crab change shells watch it go near a shell but dont move cause he’ll hide if you move so eventuelly he’ll change and dont be surprised if there is a really big thing on his but! but this is really funny! ok, i brought my hermit crab to school and my vice principil has hermit crabs at school to so i put my hermit crab in her tank and she had a few shells for her hermit crabs so my crab stole a shell from her cage and i had no choise but to bring him home with that shell!

i was looking in my tank and

Submitted by jaime (not verified) on Tue, 09/30/2008 – 20:17.

i was looking in my tank and my crabs have finally come out after molting for months but i am missing one lol where would be teh best places to look for him? please help

I got my hermit crab about 1

Submitted by Klutzy (not verified) on Sat, 10/04/2008 – 10:57.

I got my hermit crab about 1 month ago, i luv it so much and try and take care of it the best i can, i had 3 at first but the other 2 died in the molting process, they came out of their shells and stayed for 2 days. the first day they were all active and happy the second day they were both dead. I did everything possible i could to take care of them, and my last one has signs of molting, so plz help me , tell me what to do, before Klutzy is not so muchzy alive!!!!!!!!!!!

Hi today i just pick up my

Submitted by Anonymous (not verified) on Thu, 10/16/2008 – 17:03.

Hi today i just pick up my hermit and i saw that 2 of his legs fell off . what can i do will he be alright ?? He never comes out of his shell he very small for his shell but he wont change into a diffent one ..what wrong
please help :(

You should pull off the rest

Submitted by Anonymous (not verified) on Sun, 11/02/2008 – 17:57.

You should pull off the rest of its legs and then it will grow new ones. It will keeps it living.. So pull them all off! and do it soon or it could die!

you don’t need to worry your

Submitted by Anonymous (not verified) on Sun, 11/02/2008 – 20:21.

you don’t need to worry your hermit crab is going to be ok.all hermit crabs shed their legs. eventually they will grow new ones back and it will be back to normal. also hermit crabs are suppost to have big shells that way there is plenty of room to grow into it. its like getting a new pair of shoes. they dont fit right away but you’ll grow into them soon!

well i think that the mother

Submitted by Anonymous (not verified) on Sun, 11/09/2008 – 00:38.

well i think that the mother or something in the cage died and split into peices because my hermit crab mother died and the mother was broken into peices when we found it dead and a baby in the shell that she was living in.

hi my hermit crabs claw just

Submitted by Anonymous (not verified) on Sat, 11/15/2008 – 12:46.

hi my hermit crabs claw just fell off what should i do plese help

Do not worry. Your hermit

Submitted by Patrick (not verified) on Fri, 11/21/2008 – 20:30.

Do not worry. Your hermit crab will live fine. If you have more than one crab I would either separate them or take a little more care of the claw-less one. After molting a few times, it will be back, good as new. One of my hermit crabs was missing two legs when I bought him, and he recently molted. His legs are not entirely back but they are there. If you start to see gel-like goop where the claw used to be, this is a GOOD thing. That will be solid after it molts, so it slowly grows back.

My dear….ur hermit crab

Submitted by Anonymous (not verified) on Thu, 12/04/2008 – 14:33.

My dear….ur hermit crab DID NOT have a baby -____-. It just simply moulted. What you thought was the dead crab was actually it’s exo skeleton and not the crab itself. Dreshly moulted crabs look a bit pinkish. I hope you did not throw the exo skeleton away because the new crab needs to eat the exoskeleton to get enough calcium and nutrients. Hermit crab babies (if they ever have any)only hatch when they come into contact with seawater. They are born in the sea and will climb out and onto the beach when they are older. SO…no…….ur crab did NOT have a baby .

How to care for your Hermit Crab

28 Dec 2008 / 0 Comments / in Hermit Crabs/by Carl

Here are some basic tips for keeping your hermit crabs healthy and happy. Keep in mind the two biggest factors are the temperature and humidity of your crabariums.

Keys to Hermit Crab Survival:

  • Keep temperature inside tank between 72-85°F.
  • Humidity should be between 70-80%.
  • You must use de-chlorinated water for your crabs fresh and salt water.
  • Salt water (1 tsp. non-iodized salt per cup of water)
  • Commercial food should be supplemented with fresh foods, like those listed below.
  • There must be enough sand for you largest hermit crab to burrow and molt.
  • Give each of your crabs two extra shells.
  • Friends – hermit crabs are very social animals and do really well when they have lots of friends.

Materials needed for your habitat:

  • Sand
  • Tank with lid
  • Shelter/hiding places
  • Thermometer
  • Hydrometer
  • Materials to climb on
  • Tank heater
  • Food dish
  • Salt water dish
  • Fresh water  dish
  • De-chlorinator
  • Salt (non-iodized)

Tips for maintaining your habitat:

  • Change food every other day to prevent mold growth.
  • Spot clean tank every other day.
  • Every three months change the sand, you can buy new sand or you can bake the old sand to sterilize and clean it (350°F for 30 minutes).
  • The water dishes should be deep enough for the crabs to soak in but not so deep that they can’t crawl out.
  • The sand should be the consistency of sand used to make sand castles.
  • If your tank’s humidity gets too low you can take a squirt bottle and spray the tank down with de-chlorinated water.

Hermit Crab Workshop

28 Dec 2008 / 3 Comments / in Hermit Crabs/by Carl

Today was our Family Science – Hermit Crab Workshop. We had about 38 participants that learned about Hermit Crabs and left with two crabs to take home as new pets. We hope that in addition to enjoying the new additions to their families, the participants will continue to talk back to us via this website. We want to know how the crabs are doing, how they are behaving, heck, send us some photos of the little critters! Check out our Hermit Crab discussion forum for the latest discussions about the crabs.

Below is some information about Hermit Crabs that our workshop participants should find useful and some photos from today.


crab_workshop_1crab_workshop_2crab_workshop_3

What has ten legs, lives in a mobile home with a purple door, and needs a weekly bath but never uses soap? It’s a Coenobita clypeatus (sen-uh-BID-uh klih-pee-AY-tus), also known as a land hermit crab, a purple pincher, a tree hermit crab, or a red legged hermit crab! Whew! What a lot of names for one small animal.

There are several families of hermit crabs. Those that live in the ocean are marine hermit crabs. Hermit crabs that live on land are terrestrial, or land hermit crabs.

Coenobita clypeatus is a particular species of land hermit crab. When you look closely at one of these interesting creatures, you can see why it is sometimes called the purple pincher. The largest claw, the cheliped (KEE-luh-ped), is usually a very deep purple. Likewise, if you look at the legs, you can understand why it is also called the red-legged hermit crab. These colors are more evident on some crabs than others. And, although they don’t live in trees, land hermit crabs can climb trees and almost anything else they can grip with their claws!

Where are they found?
There are over 80 species of land hermit crabs found around the world. Usually they live where it is warm, often near the ocean. The purple pincher is found from southern Florida to Bermuda and the West Indies, and farther south to Venezuela, South America. It is the only land hermit crab native to the shores of the Western Atlantic Ocean. Adult land hermit crabs rarely live right on the beach. They prefer dry ground, close to a fresh water source. They will sometimes move inland 15 kilometers (over nine miles) from the ocean.

What do they eat?
Hermit Crabs are omnivorous (ahm-NIV-or-us) scavengers. They eat just about anything, plant or animal. Some of their favorite foods are coffee grounds, rotten fruit, and decaying meat. Hermit crabs help keep the areas they live in free from dead animal carcasses and decaying vegetation. When they live close to human beings, land hermit crabs will eat from garbage dumps and drink water from leaking faucets or animal pens.

A Hermit Crab’s Home
Hermit Crabs use shells to protect their abdomens. They carry shells with them wherever they go. The shell not only protects the soft abdomen of the hermit crab, but also gives the crab a means of carrying a supply of water with them to keep their gills moist. Hermit crabs are unable grow their own shells, so they use shells from dead sea or land snails.

The Hermit Crab Anatomy
Hermit crabs have several parts that make up their body. They have segmented (divided) body parts and an exoskeleton (a hard covering on the outside of the body, rather than an internal skeleton like we have); it is identified as an arthropod (AR-thruh-pahd). Spiders and insects are also arthropods. Because it breathes with gills, and has two pair of antennae (an-TEN-ee) in front of its mouth, it is also a crustacean (krus-TA-shun), a large class of arthropods that live in, or frequently goes into, water.

Instead of having a backbone or skeleton inside its body like you do, a hermit crab has an exoskeleton made of chitin (KY-tin). When we grow, our skeletons grow with us. But a crab’s exoskeleton does not grow as the crab grows. When a crab grows too large for its exoskeleton, the exoskeleton splits open, and the crab crawls out. This is called molting. After molting, a crab’s body is very soft. It takes up to ten days for the new exoskeleton to harden.

Hermit crabs have compound eyes. This means that a hermit crab’s eye is made up of many independent light sensitive units. Instead of seeing one image like you do, a crab sees multiples of the one image.  This allows the hermit crab to detect fast movements and see in a very wide angle.

More information on Hermit Crabs

  • How to Care for your Hermit Crab
  • Some common questions about Hermit Crabs
  • Ask questions or talk with other crab owners in the Hermit Crab discussion fourm

We named our hermit crabs

Submitted by Anonymous on Sun, 03/25/2007 – 11:01.

We named our hermit crabs Herman and Shelby!

Herman and Shelby are

Submitted by Lacey on Sun, 03/25/2007 – 12:08.

Herman and Shelby are wonderful names. Has anyone seen their crabs change shells yet? I noticed last night when I went home that one of my own hermit crabs is in the process of molting.  His name is pirate because he only has one eye, however when he resurfaces after molting he will have regenerated his lost eye. It will be smaller than his other eye but he will actually regrow his missing eye! I think that is so cool. I’ll keep an ‘eye’ out for pirate and let you know when he is done molting. :-)

Our crabs are named Chuk and

Submitted by Anonymous on Sun, 03/25/2007 – 15:54.

Our crabs are named Chuk and Pukrs (Puckers). Yes! One of our crabs switched houses shortly after we got home. We haven’t seen much action since and believe they may be too cold. Overnight we tried a lamp with an incandescent bulb. It warmed the tank a couple degrees but our house is cold so I don’t think it was enough. We went today and purchased a heater. Hopefully they are more actie tonight.

Our Crabs are great! one is

Submitted by Anonymous (not verified) on Fri, 06/20/2008 – 16:23.

Our Crabs are great! one is in the process of molting and the other 5 are very active. We are thinking of getting another.

I have one hermit crab. I

Submitted by Anonymous (not verified) on Fri, 07/18/2008 – 08:19.

I have one hermit crab. I haven’t named him yet. He is very active and quite “silly” He climbs all over the place. Very cool pets!

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