FEATHERS

These are probably pigeon feathers but they illustrate the basic differences of the two commonest of the seven types of feather: flight feathers and downy feathers.

The flight feathers are on a bird's wings.  They form a light but firm vane which can push air and propel the bird.  One side is wider than the other and there is a little bit of down near the base.

Underneath the smoothest feathers on the bird's body are fluffier feathers - down.  Birds have to keep all their feathers in good condition, especially the flight feathers and tail feathers, by preening.  They comb them with their bills.  

Eventually the feathers need to be discarded and replaced. If you find a feather on its own, it has probably been moulted.

If you find a whole lot of feathers in one place it usually indicates an attack by a predator.