Two functions are to help aid in flight (only for flight feathers) and to provide an insulation for the bird against the hot and cold weather.
lift for flight and conserving heat
Countour feathers and down feathers
It Provides warmth..and allows the bird to fly
The feathers of a bird help to keep a bird warm (like ducks) and to give them the ability of flight.For example, penguins have oils in their feathers to keep them warm in the Arctic/Antarctic.
2 feathers crossed
The down feathers (or the soft feathers underneath the outside feathers).
It is told that penguins have around 5000 feathers by maturaty and these feathers change completely in a two year cycle
It means. "two feathers." And, because feathers were formerly used as writing instruments, it can also mean, "two pens."
a 2 year old peacock has about 50 feathers...
Two functions of protein are growth and repair.
You need to clip their feathers at least every two months. You clip only a bit of their feathers and DON'T GO INTO THE BONE OR ELSE...
coot