FusionDex

Caterki crawls along the edge of its wooden loop to roll it around, eating leaves and collecting small objects. It spins these into colorful cocoons that it hangs from its loop like ornaments.

It never lets go of a key that it likes, so people give it the keys to vaults and safes as a way to prevent crime. Its voracious appetite compels it to devour leaves bigger than itself without hesitation.