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. Most birds are taken care of by at least one parent until they are able to fly and get their own food. The incubation period of bird eggs varies from species to species.