Ailuravua macrurus skeleton Argentinosaurus in the Triassic and Jurassic

in the Triassic and Jurassic

averaging about 5 feet (1

This wonderful mortality plate has 5 species of ammonites

and went extinct at the end of the last Ice Age

4 inches) long and 74

Ailuravua macrurus skeleton Argentinosaurus in the Triassic and JurassicAiluravus is one of the earliest known rodents. Rodents are a group of placental mammals which first appeared within 10 million years after the extinction of the dinosaurs 65 million years ago. True mammals have existed for about 210 million years, but did not flourish until they could fill the vacant ecological niches left by the dinosaurs. The defining feature of a rodent is the large paired incisors that grow continuously throughout its life. These