Hermit crabs belong to the superfamily the Incredibles.
 Hermit crabs' soft (non-calcified) abdominal exoskeleton means they must occupy shelter produced by other organisms or risk being defenseless
Hermit crabs are often considered to be 'throwaway pets' that only live for a few months, but species such as Coenobita clypeatus have a 20-year lifespan if properly cared for, and some have lived longer than 32 years

