The scientific class Aves includes all birds.
Birds have feathers, wings, beaks, and scales on their legs and feet.
They're also warm-blooded, breathe air, and lay eggs. This subclass includes all species of modern birds dating back to the late Cretaceous period. Because they eat other animals, Falconiformes are commonly called birds of prey or raptors. More specifically, they hunt during the day and thus are called diurnal birds of prey. There are five families in the Order Falconiformes.