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.
In most cases, birds use feathers to fly and feathers can also insulate a bird and keep it warm. All birds lay eggs and after a period of being incubated, or kept warm, young birds will hatch or emerge from the eggs. Reptiles will also lay eggs, but they do not have feathers. Mammals are also warm-blooded and breathe air like birds, however, mammals are hairy and their young are born alive. The mammal's skull is unique which allows the brain to be more complex than in other animals.