Two dinosaur species now really extinct, new research

Dear Kitty. Some blog

This video says about itself:

Mammals Vs. Dinos- Dinosaur Hunting

On the Science Channel‘s “Mammals vs. Dinos,” although most small prehistoric mammals were nocturnal, the Repenomamus hunted by day and preyed on small [Psittacosaurus] dinosaurs which was a sign of the evolution of mammals.

From the University of Pennsylvania in the USA:

Fresh analysis of dinosaur skulls by penn researchers finds 3 species are 1

A new analysis of dinosaur fossils by University of Pennsylvania researchers has revealed that a number of specimens of the genus Psittacosaurus — once believed to represent three different species — are all members of a single species. The differences among the fossil remains that led other scientists to label them as separate species in fact arose from how the animals were buried and compressed, the study found.

“Because of the vagaries of fossilization, no two fossils are the same,” said…

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