Triceratops Dinosaurs

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Triceratops Description, Size, Fossil, Diet, & Facts ... Triceratops: Triceratops, large quadrupedal plant-eating dinosaur that had a frill of bone at the back of its skull and three prominent horns. Fossils date to the final 3 million years of the Cretaceous Period (145.5 million to 65.5 million years ago), making it one of the last of the non-avian dinosaurs to have evolved. Triceratops - Wikipedia Triceratops is a genus of herbivorous ceratopsid dinosaur that first appeared during the late Maastrichtian stage of the late Cretaceous period, about 68 million years ago (mya) in what is now North America. It is one of the last known non-avian dinosaur genera, and became extinct in the CretaceousPaleogene extinction event 66 million years ago. Dinosaur - Wikipedia The discovery that birds are a type of dinosaur showed that dinosaurs in general are not, in fact, extinct as is commonly stated. However, all non-avian dinosaurs, estimated to have been 628-1078 species, as well as many groups of birds did suddenly become extinct approximately 66 million years ago.