A new study by Yale paleontologists charts the radical evolutionary changes to the thigh bones of dinosaurs and birds that allowed them to stand on two feet. Dinosaurs and birds wouldn’t have been able to stand on their own two feet without radical changes to their upper thigh bones. A new Yale paleontologist study... read full story
"We figured out how the femoral head, a critical part of dinosaur anatomy, developed,"
Photo: Seagull - dinosaur - prehistoric birds.