The same way you would look after a crab from the pet store! (make sure that you know whether it is a land or water crab).
Yes the Blue Crab is wild - by the simple fact it lives in the ocean means it is wild. It is not tamed nor is it farmed.
Hermit crabs are only known to mate in the wild. To tell what sex a crab is look at the back underside of the legs if they have a dot it is usually a female.
NO!
No they leave
crabs are scavengers in the wild. I am assuming it is a hermit crab you are asking about. There are a number of crab foods you can find at your local petstore.
it looks like a crab
They live on the beach and in the water.
in the soil
Up to 20 years
red & yellow
-( 0 0 )- -| |- -(____)- <<<<< this is an example of your crab!
Deep in the ocean there is a hairy crab that doesn't look ordinary.