Birds are warm-blooded vertebrates that have feathers, beaks, and lay eggs. They breathe through lungs and have three types of feathers that help protect them and enable flight. The song thrush is a small brown bird known for its sweet song in the early morning and late afternoon. It builds nests in tree forks and eats worms, snails, and insects. Owls are nocturnal birds of prey with sharp claws and good night vision. They nest on the ground and lay eggs over several days rather than all at once like other birds.