which is impressive for a Triassic reptile

Approximate measurements of the Dunkleosteus:

La descripción del esqueleto postcraneal no está completamente conocida

adopts a defensive stance

climatic changes and hunting by humans probably contributed to the extinction of this species at the end of the Pleistocene

Guanlong wucaii Torosaurus which is impressive for aGuanlong wucaii was a carnivorous dinosaur that lived during the Late Jurassic period, approximately 156 million years ago, in the Oxfordian, in what is now Asia. This dinosaur is notable for being one of the first known members of the tyrannosauroid group, the precursors of the famous Tyrannosaurus rex. In terms of size, the Guanlong wucaii was relatively small compared to its better known descendants. Fossils indicate that it reached a length of