Very Cold Bois: Floof, great climbers, overheat easily.

Cold Bois: Feathers gotta lotta down, burrowing bois, dey sink.

Medium Bois:
Fuck em. They got long ass necks, and tiny tails, and huge heads. Who drew these, jesus.

Warm Bois: A few waterproof feathers, good swimmers + live on islands, get cold easily.

Very Warm Bois: Agile smol bois, great sprinters, smallest micro.