Hermit crab (Coenobita scaevola), retracred into a shell; Abu Dabbab Bay, Red Sea, 2015
Hermit crab use abandoned shells for its own protection against predators. As hermit crab grows, it has to sometimes leave the tight shell and find a more comfortable one.
Hermit crab (Coenobita scaevola); Abu Dabbab Bay, Red Sea, 2015
Please visit also Tony's Coenobita website which is focused on these species.