Ah, feathers. A beautiful thing, they are. They provide insulation by heat by trapping heat. If a bird is cold, it will generally fluff up it's feathers in order to capture heat. If it's cold, it'll slick them down to get rid of excess heat.
the feathers trap the heat inside and insulate the whole bird.
goose feathers - also known as down.
up feathers are needed for warmth
feathers!
Because all birds live in different environments and weather conditions. ------------------------------------------------------------------------------------- Birds feathers have evolved to serve a number of purposes, the most important of which are warmth and flight. The feathers need for warmth have to be small, soft and fluffy while the feathers needed for flight have to be large, strong and sleek.
For warmth.
for flying and warmth
thick feathers for warmth and white feathers for camouflage
It Provides warmth..and allows the bird to fly
Countour feathers and down feathers
It is needed for warmth. :)
protection and warmth at night, and the ability to fly
contour feathers,flight feathers,primary feathers and secondary feathers
I believe that they do this simply to keep warmth on their bodies while they are sleeping.
water oxegon and warmth
warmth and moisture is needed, so are the right air and light conditions