although birds do not have hairs but feathers to carry out this task. Also the feathers on the bird which make up a large surface area compared to the surface area on the body help to separate the warm air from the cold air, keeping the cold air away.
Just like humans sweat to cool there body down, birds ruffle their feathers to cool themselves down
For birds they ruffle there feathers to make them selves look big and scary to defend them selves from the pretender and try to frighten them away. You wouldn't want to go attack something that looks big and overpowering would you?
Don't ruffle my feathers.
Please dont ruffle my pet doves feathers!
It is interesting to watch a wild turkey ruffle it's feathers.
If you bother a bird, it will ruffle up its feathers in irritation. "Don't ruffle any feathers" is just an idiomatic way of saying "don't annoy anyone" or "don't stir up any trouble."
=Feathers keep birds well insulated from cold weather and prevents air from seeping in.=
You ruffle my feathers when you act like that.
to prevent the cold !!
It uses its spear-like bill/beak. And i assume it has claws on its feet... All birds flap their wings and ruffle their feathers to confuse their prey.
The phrase to ruffle your tail feathers means to annoy someone and get the angry, when a ducks becomes frighted or is bothered it makes itself seem bigger by ruffling its feathers so it puffs up.
So that they wouldn't have sick when it was a cold day.