All tetrapods descended from a common ancestor that just happened to have limbs with five digits. And over the eons of evolution following that, natural selection worked with variations on ...

Transitional fossils help scientists bridge gaps in the tree of life, resulting in a picture of gradual evolution over millions of years.

Because all later land vertebrates, or tetrapods, can be traced back to ... one in South America and one in Australia. It seems that evolution has forgotten them, because these ancient "living ...

The over-arching goal of this project is therefore to understand how whole-body shape and size have interacted across major shifts in ecological and environmental niche occupation during tetrapod ...