They are warm blooded.
They have feathers and a beak.
They breathe by lungs
All birds are terrestrial.
There are different groups:
Runners (aves corredoras)
Birds of prey (aves rapaces)
swimmimg birds:palmípedas( anátidas) (swans, ducks..)
Wading birds (zancudas)
Fowl (gallináceas)
Perching birds (pájaros)
