Hippopotamus amphibius

it had a more efficient semi-upright posture than many earlier reptiles

some skeletal adaptations indicate an incipient transition to a more upright posture

until its extinction about 10

Oviraptor “Spike” skeleton Variant:Unprimed Hippopotamus amphibiusOviraptor was an oviraptorid theropod dinosaur from the Late Cretaceous of Mongolia, famous for its light, highly specialized anatomy, and for providing key information on the reproductive behavior and biology of non avian theropods. Far from the initial image of an "egg thief," it is now interpreted as an animal closely related to birds, probably omnivorous or opportunistic, and with advanced parental care. The Oviraptor skeleton is characterized by