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 ...

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 ...

Because all later land vertebrates, or tetrapods, can be traced back to ... of the lungfish is unexpectedly stable and the gene arrangement is surprisingly conservative. This fact enabled the ...

Sitting on top of a granite base are numerous concrete tetrapods weighing more than two tons each. They are placed carefully in position and locked with each other to create a formidable structure.