Question

Почему птицы нахохливаются на морозе

Answer 1

Когда птицы нахохливаются, их перья взъерошиваются и, благодаря этому
между перьями становится больше воздуха, который плохо проводит тепло.
Так птицы сохраняют тепло своего организма и не переохлаждаются 

Answer 2

Why do birds puff up in the cold?

Birds puff up their feathers in the cold as a way to keep warm. This behavior is known as "fluffing" or "piloerection." When birds puff up, they trap a layer of air between their feathers, which acts as insulation and helps to retain body heat. By increasing the volume of their feathers, birds can create a thicker layer of insulation, reducing heat loss and keeping themselves warm in cold temperatures.

How does puffing up help birds stay warm?

When birds puff up, they increase the amount of air trapped between their feathers. This layer of air acts as an insulating barrier, preventing heat loss from their bodies. The trapped air is warmed by the bird's body heat and creates a buffer against the cold external environment. This insulation helps to maintain the bird's body temperature and keep it warm in chilly conditions.

Are there any other reasons why birds puff up?

While puffing up primarily serves as a way for birds to keep warm in cold weather, there are a few other reasons why birds may puff up:

1. Displaying dominance or aggression: Some birds puff up their feathers as a display of dominance or aggression towards other birds. This behavior is often seen during territorial disputes or when defending their nesting sites.

2. Attracting a mate: Male birds may puff up their feathers as part of their courtship display to attract a mate. By puffing up, they can appear larger and more impressive to potential mates.

3. Camouflage: Certain bird species, such as the ptarmigan, puff up their feathers to blend in with their surroundings. This helps them to camouflage and avoid detection by predators.

Conclusion

Birds puff up their feathers in the cold primarily to keep warm. By trapping a layer of air between their feathers, they create insulation that helps retain body heat. Puffing up also serves other purposes, such as displaying dominance, attracting mates, and providing camouflage.