Mean atmospheric O2
Geologic Time Scale
Psittacosaurus and pond
An Early Cretaceous psittacosaurid ceratopsian dinosaur of the genus Psittacosaurus prepares to dine on a scrubland cycad 130 million years ago in what is today central Asia.
Psittacosaurus was one of the earliest known ceratopsians, a family of horned, frilled dinosaurs that includes the better known Triceratops. Psittacosaurus was about 3 to 6 feet long and weighed 50 to 175 pounds, depending on species. At least one species had long, quill-like structures on its tail and lower back. With a parrot-like beak it is believed that Psittacosaurus was a plant-eater.
Copyright © Walter B. Myers. All rights reserved.
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