It possessed limbs transformed into rigid flippers

El esqueleto del Protoceratops andrewsi revela adaptaciones importantes a su forma de vida

suited to chewing non-abrasive vegetation

These fossils have provided valuable information on the anatomy and behavior of this extinct species

and associated fauna

Xiphactinus audax Variante:Sin imprimar It possessed limbs transformed intoXiphactinus audax was a large predatory bony fish from the Late Cretaceous of North America, known primarily from fossils recovered from marine deposits of the former Western Interior Seaway, especially the Niobrara Formation of Kansas, although its distribution extended across much of the North American interior basin. Originally described by Joseph Leidy in 1870, this taxon belongs to Ichthyodectiformes, a group of Mesozoic actinopterygian fishes