Birds
Birds are a kind of vertebrate animals, most birds have feathers and wings, and can fly, but not all of them can. Birds do not have teeth, but a hard beak or bill instead. They use the beak to pick up food.
The food they eat gives them energy so that they have a power to fly. Flying takes a lot of energy. When flying, they make different movements, sometimes by giding with their wings held still or by flapping their wings up and down.
Unlike humans, birds do not give birth to babies. Instead, they lay eggs. After lying eggs, a mother bird sits on the eggs to keep them warm until they hatch.
Birds spend most of their time looking for food using their keen eyesight. They use their beak and claws to get bugs, worms, small mammal, fish, fruit, grain or nectar. Although birds eat different food most of them feed on insects. Those that eat insects are cal insectivores.
Based on the text, we know that the birds...