Humans have mostly the same bones as many animals, just in a different configuration
■Yes, but not where you might think. The bend we see in a bird’s leg may look like a knee bending backwards, but it’s actually the ankle. Bird knees are inside the body, hidden by skin and feathers. The long foot begins at the ankle joint, but it isn’t all used to stay in contact with the ground. All a bird’s weight is carried by its toes.