Zygorhiza, early whale tooth molar Dimetrodon while a human arm can

while a human arm can rotate 360 degrees at the shoulder and move through 165 degrees at the elbow

Pachycephalosaurus was one of the last non-avian dinosaurs before the Cretaceous extinction event

probably preying on other large dinosaurs like the hadrosaur Saurolophus or the sauropod Nemegtosaurus

perhaps an oxbow lake

prepared and mounted this virtually complete Cladastes

Zygorhiza, early whale tooth molar Dimetrodon while a human arm canZygorhiza was an archaeocete whale that lived during the late Eocene, about 40 million years ago. This ancient marine mammal had a long snout that contained many sharp teeth. The nostrils were located towards the end of the snout. Although retaining some land animal characteristcs (like differentiated teeth), it was more whale like than Basiliosaurus. It had a snake like body and small hindlimbs (including a mobile knee and toes). Many fossils have