Birds come in all shapes, sizes and colors. With a sleek, streamlined body, birds are covered with feathers (either colorful or subdued) and have two legs with front limbs that are modified into wings. Their jaws are covered by a horny beak.
When not flying or foraging for food, birds tend to nest and roost (sleep, sit, stand or rest), often communally. Birds can live anywhere and most birds migrate to warmer areas when the weather gets colder.
A bird’s diet usually depends on its breed and size and may include flowers, grass, seeds, worms, small invertebrates, insects, fish, small prey and animal corpses, as well as trash and “people food”.
Many bird species bond in pairs and have distinct courtship rituals. All birds are bisexual and generally reproduce at a young age and with high spring temperatures. Female birds lay sets of eggs, referred to as clutches. Clutch sizes vary within and among bird species.