No they do not.
No hermit crabs do not grow back skin
Congrats! Your hermie has just molted! Hermit crabs have exo skeletons so in order to grow they have to shed their skin. tHIS is a VERY stressful process for them, so never interupt them. They dig underground to molt, so they have to eat and drink a lot before so, because they can be underground for weeks to months.
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Unless it's organic, yes, peel the skin. Hermit crabs are arthropods, just like insects. The insecticides they spray on the commercial crops will likely have negative affects on hermit crabs if they com in contact with them on the skin of the vegetable.
no it can only pinch you
Yes, they also eat it for extra nutrition
molted means to shed your skin
No, they are invertebrates, meaning they need to molt their skin to grow an example is a snake, they don't grow, they molt their skin to grow, just like the hermit crab.
Never, they hide in their shells until their skin is hard.
No they need to eat food that are bright colors like tomatoes, mangoes, and kiwies.
A hermit is a person that keeps to themselves and does not live with others. They tend to be loners. The Hermit Crab is named that way because they live alone in a shell that was not theirs to begin with. They find an empty shell and move in. Kind of lika a squatter who moves into an abandoned house away from others.
A healthy crab generally shed it's skin, or molts every 18 months. This varies, depending on it's size. Smaller crabs, tend to molt more often.