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The story of the egg begins in the ovary. The females of almost all birds have only one functional ovary, oviduct, and uterus.

Most birds don’t have such bragging rights, however: Males in 97 percent of bird species have tiny penises or lack them entirely. Instead, they shoot sperm into a female bird’s body through an exit called a cloaca. The absent bird penis is a head-scratcher for scientists who study animal reproduction.

The intricate moves of a mating dance and the charming songs used to woo partners can help distinguish species, so birds are sure to choose genetically compatible mates. Different courtship behaviors also reduce territorial aggression, letting two birds relax to form a pair bond.

Birds do not have any hair or fur to keep them warm; instead, they have feathers. Feathers keep birds warm and also help insulate them from the water. Feathers are important for keeping birds warm and dry but they also have some other important jobs.

Now scientists have discovered, for the first time, that the birds form long-lasting and loyal friendships—and that physical traits may play a role in those bonds.

Feathers are the magic material that cover the bodies of all birds and help them to fly. But they’re not just for flight. Feathers are fantastic for keeping warm, which is why even flightless birds such as ostriches have them.

A. Yes, they do! They’re just hidden under feathers called auriculars that cover the ear openings on the sides of their head.

Because unlike mammals, birds have no external ear

Most birds use their feet for walking or perching, but feet can be weapons (owls), paddles (ducks), and hands (parrots). Feet are also vital for scratching; how else could a bird reach its head?

Birds don’t have nipples, as they are not mammals. Although, we talk about birds’ breasts they don’t have mammary glands which mammals use to feed their young milk.