Owls have a high metabolism, which means they generate a lot of body heat. When an owl is too warm, it will puff up its feathers to increase the surface area of its body, allowing more heat to escape.
2. To intimidate predators or threats.
Owls are preyed upon by other birds, mammals, and even reptiles. When an owl feels threatened, it will often puff up its feathers to make itself look bigger and more intimidating.
3. To attract a mate.
Courting male owls will puff up their feathers to make themselves more appealing to females. Puffing up also shows their health, strength, and fitness. This also helps the male owl seem larger than he is.
4. To protect themselves.
Owls have relatively soft skin and bones. When they are attacked, they will often puff up their feathers to protect their vulnerable areas. This can help to deter predators and make it more difficult for them to grip the owl.
5. To conserve heat.
Owls use their feathers as insulation to help keep them warm in cold weather. By fluffing up their feathers, owls can create more air pockets between their feathers which helps to trap heat and keep the owl warmer.