All birds can fly.
Birds live in all climate zones.
Most birds stay in their nests for a few weeks.
Birds are cold-blooded animals.
Birds use their beak to get food.
Birds have bones that are hollow.
Birds always keep the same feathers. They never lose them.
All birds have pointed and sharp beaks.
A bird's heart beats much faster than a human heart.
Birds have an excellent sense of smell.
The air flows faster over the top part of the wing than under the bottom part.
Some birds migrate to other places to get food.
Pigeons are birds that travel the longest distances