蟹になるアサリ crabbed clam

蟹になるアサリ crabbed clam,japan
In Edo period,Japanese people believed that everything have a power changing their form to the other creature.This creature is a small clam,an usual eatable clam in Japan,but some can become a crab.This is a changing form,and then this creature become a complete crab.Shells are moved out.