Roly-Polies

Roly-polies are very interesting creatures. Surprisingly, they actually have gills and use them to breathe. For those who aren't aware what roly-polies are, they are terrestrial crustaceans that have adapted to living on land. They just forgot about the whole gills need water issue.

They're basically a small insect with many legs that can roll itself into a ball like shape.

Due to the gills they require humid environments as their gills would otherwise dry out leading to them suffocating.