Snakes creep around because they don't have legs.
Amphibians are also cold-blooded.
Frogs, toads, and salamanders are all amphibians. Even though they can live on land, amphibians live near water because they have to stay moist. Salamanders look like lizards, except they don't have claws or scales. Birds are warm-blooded and breathe air like mammals do, however, birds have unique adaptations which make them special. All birds have feathers that serve a variety of functions.