There's nothing magical about the number, yet five digits at the end of their limbs is a motif that runs through all the animals with four limbs, called tetrapods. Even when there are fewer than ...

"The thing that really stuns me is that every innovation, every invention used by tetrapods on land ... "A little bit of cranial kinesis that's maintained in modern mammals!" Sign up for new weekly ...

In this video segment from NOVA: "Judgment Day: Intelligent Design on Trial," paleontologist Neil Shubin recounts a fossil discovery that added another compelling piece to the body of evidence ...

Scientists have known for decades that synovial joints were present in early tetrapods, and more recently also discovered ... The study, published in PLOS Biology, examined the skeletons of modern-day ...