Credit: Peter Bishop/Museum of Comparative Zoology, © President and Fellows of Harvard College Mammals, including humans, are ...

The Dimetrodon were instead more closely related to mammals than dinosaurs, birds, and surviving reptiles. Dimetrodon was thought to be one of the oldest dinosaurs discovered in the world when a ...

A new study reveals that the transition in mammals from sprawling to more upright limb postures occurred later than ...