👉 In biology, a pinnate is a type of vertebrate animal. These animals have two pairs of legs with each leg attached to a separate backbone, which allows them to walk on two legs at once, much like a horse or a duck. Pinnates are also known as "tusked" animals due to the way their bodies are formed and the fact that they have two sets of bones: one long bone called the tibia, which is attached to the pelvis, and