I'm pretty sure this should be birds because birds have light bones which helps them fly because well, they need to be light in order to glide on air, and they have feathers and a beak to help them eat and talons to help them hold their food or have a good grip on branches or perches so they stay stable. aka talons on birds are like feet on humans, and beaks are like mouths on humans, feathers are like a coat on birds and instead of giving live young like mammels do birds hatch from eggs.