there are fluffy downy feathers that keep the animals warm, but in many birds, there are also feathers that grow continuously and break down into a powder that waterproofs the other feathers to ...

Birds have a consistent internal temperature of about 104 degrees. Birds keep warm by shivering, fluffing their feathers, cuddling together and tucking in their feet and bills. Birds increase ...

This image shows the magnified barbules of a white peacock's feathers, which feature long appendages that diffuse thermal radiation to keep the birds warm. Disclaimer: AAAS and EurekAlert!