The document discusses common features of different types of birds. All birds have wings to fly, beaks instead of teeth to eat with, and hollow bones that aid in flight. Peacocks are omnivorous birds known for their colorful feathers that they use for display. Crows are also omnivorous and fly or live together in groups, known for their intelligence and loud calls. Ducks typically live near water and have bills instead of teeth. Some ducks migrate to breed. Ostriches are the largest birds and cannot fly despite having wings; they use their powerful legs to run fast and lay eggs larger than any other bird.