Feathers are highly modified scales. There are different types of feathers that have different uses. Some amazing hunters, like eagles , have eyesight that is five to six times sharper than a person's. They can spot small prey from a mile away. Birds spend most of their time looking for food .
Birds mostly use their keen eyesight to find food.
They use their beak and their claws to get bugs , worms , small mammals , fish , fruit , grain, or nectar . Birds play a very important part in the natural control of insects and in the dispersal of seeds. Some birds, like the tiny, nectar-eating hummingbird are important pollinators of some flowering plants . Birds bear their young in hard-shelled eggs which hatch after some time. Birds build nests for breeding in trees, on cliffs, or on the ground.