I witnessed a small crab successfully challenge this
larger crab for his shell. The larger crab became
homeless and decided to move into this tiny shell.
As determined as he was, the shell was just too small!
Notice the light, tanned-colored back end of the crab.
This area is very soft and has a texture similar to
that of a grub. Hermit crabs insert their rumps into
hard shells for protection, keeping a firm grip with
small "feelers" that protrude just below the interface
between the hard and soft sections.