Why do birds lose their feathers?

1.Many flying birds need to maintain a streamlined body shape to reduce air resistance during flight, so they spend a lot of time combing their deranged body feathers to keep their feathers and body contours in optimal flight condition.

2.Many water birds, such as the geese and ducks, secrete oil from their tail glands, and they use their beaks to apply oil to the surface of their feathers to prevent them from water, so that they can swim freely under water. In addition, parrots, egrets and other birds also have some specialized feathers, these feathers can continue to grow, and during the growth process, the feathers will break down into powder, they will comb the feathers, and scatter the powder on the body feathers, which can also play a role in waterproofing and making the feathers shiny.

3.Grooming feathers can also get rid of annoying lice and fleas, especially feather lice, a type of lice that live exclusively on the body surface of birds. Keep your body neat and healthy.

4.Birds grooming each other's feathers is also a social activity. Birds such as the Noise Thrush of the Warbler family often like to move close together in groups and groom each other's feathers.

This is especially important for birds such as parrots and albatrosses, as grooming each other's feathers can help them bond with their mates. And it's often part of their courtship rituals, or a prelude to mating.

I have experienced for myself that there are a few points:1Some birds have oily feathers that can float to adapt to life with water and protect themselves, such as ducks; 2.

Birds with obvious flying advantages should keep their bodies spindle-shaped, so combing their feathers to sort out these loose and disformed feathers due to movement is to keep their bodies spindle-shaped as much as possible to reduce the resistance to flight; 3.Because birds have abundant feathers, they are prone to parasites, such as lice, and cleaning their feathers can also remove these insects and keep their bodies tidy. That's all I can think of, and I hope it can help you.

No. Feathers are epidermal derivatives of birds, but some theropod dinosaurs also had feathers, such as Heckliosaurus, Beipiosaurus, and Sinosaurus.

There are also some dinosaurs of the family Chiosauridae that had feathers. To be precise, the feathers of birds are supposed to have been inherited from their dinosaur ancestors. However, among the animals in existence, only birds have feathers on their bodies.

In addition, chickens, ducks, geese and other poultry are birds. Although many people always like to define birds as flying animals, penguins, ostriches, etc., although they cannot fly, are also birds, because they also have common characteristics of birds, and their ancestors are often able to fly, many birds have given up flying in evolution, which is the result of natural selection. So poultry also possess feathers.