La extinción del Mammuthus columbi coincide con el final del Pleistoceno

Su rasgo más llamativo era la forma de su cráneo: ancho y aplanado

Compartía este ecosistema con otros grandes dinosaurios

It also had a slight enlargement at the tip of its snout—called the premaxillary rosette—where larger teeth were concentrated

kayetakatae

Irritator challengeri cretácico La extinción del Mammuthus columbiIrritator challengeri is a genus of spinosaurid theropod dinosaur that lived during the Early Cretaceous Period, approximately 110 million years ago, in what is now Brazil. Its name comes from the Latin "irritator", in reference to the frustration of paleontologists upon discovering that the original fossil had been altered with plaster by the collectors who found it, and "challengeri" in honor of Professor Challenger, a fictional character created by