There are 1100 species of possess an asymmetrical abdomen which is concealed in an empty gastro pod shell that is carried Round by the hermit crab. It is amount a few species available as pets. In the United States, the two types of hermit crab pets are the :Caribbean and euadorian hermit crabs.
Sometimes a crab will want to upgrade to a new shell, instigating a shell fight. When they are looking for a new shell they are more concerned about the opening size. If they like it they roll it around to dump out the debris and get in.
The life expectancy of hermit crabs is five to 15 yrs., but 25 yrs. is not uncommon living in captivity is up to 40 yrs. There is a coconut crab at about 16 in. Long which is one of the largest in the world. The smallest is a ecuadoran hermit crab which is about half an in. 
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