In terms of locomotion, the birds may be divided into:
swimming birds
laying birds
standing birds
flying birds
walking birds
Swimming birds, flying birds, walking birds.
The correct answer is "legs". To determine this, we can use our knowledge of bird anatomy or do a simple search online. Most birds are bipedal, meaning they have two legs which they use for walking, perching, and other activities. Birds do not have arms like humans or other mammals, but they have wings as specialized appendages. In the case of birds, the front two appendages are wings which evolved for flight. So, while birds do have wings, they have four legs.
