The animal known for its ability to fly is the bird. Birds possess several adaptations that enable flight, including lightweight skeletons, wing structures, and specialized muscle systems. Most birds have feathers, which play a crucial role in aerodynamics and insulation. Their ability to fly allows them to escape predators, find food, and migrate over vast distances. While many birds are adept fliers, some species, such as ostriches and penguins, have lost the ability to fly but are still considered birds due to their common anatomical features and evolutionary history.