Hermit crab

Hermit Crabs (ヤドカリ, Yadokari), a type of crab, are a bug that can be caught in the. This bug can be caught in the Japanese-exclusive, as well as in (on Tortimer Island) and. In New Leaf and New Horizons, it sells at for 1,000 Bells.

Donating to the museum
Players can donate the Hermit Crab to the Museum by talking to Blathers.

In New Leaf
After being donated, the Hermit Crab can be found in the first room of the bug exhibit next to the pond. The exhibit has this to say about the Hermit Crab:

"Hermit crabs live in empty shells they can fit their bodies into. As they grow, they find bigger shells. They're quite picky about each new shell and first measure the opening with their claws. The shells they choose usually fit well, and they'll sometimes fight one another over ownership rights."

In New Horizons
Blathers has this to say about the Hermit Crab:

"The hermit crab is not an insect... Though it most certainly resembles one! Blech! It looks much like a spider—what with its creepy eyes and crawly legs—but is, in fact, a crustacean. As such, the hermit crab has 10 legs and also wears a shell. But it doesn't grow this shell itself. It slips its soft body into shells left behind by snails, you see, and moves into ever-larger ones as it grows. Talk about a strange way to make a home. "