T-Rex Inc. - Hermit Crab Homes Medium 2pcT-Rex Crab Island Hermit Homes are intended for two purposes. First, as hermit crabs grow, they need the opportunity to change their shell to a larger more comfortable home. Hermit Crabs should always have access to these shells in their environment. Second, the hermit crab owner may want to give the crab an opportunity to change into a different shell to enhance or change its looks. Medium2 pc - UPC: 643854881045