Saturday, November 13, 2021

Animals That Lived Before the Dinosaurs

 From SciTechDaily:

A wide variety of animals have tusks, from elephants and walruses to five-pound, guinea pig-looking critters called hyraxes. But one thing tusked animals have in common is that they’re all mammals — there are no known fish, reptiles, or birds with tusks. In a new study in Proceedings of the Royal Society B, paleontologists traced the first tusks back to ancient mammal relatives that lived before the dinosaurs, and to do so, they had to define what makes a tusk a tusk in the first place.

“Tusks are this very famous anatomy, but until I started working on this study, I never really thought about how tusks are restricted to mammals,” says Megan Whitney, a researcher at Harvard University and the lead author of the study.

“We were able to show that the first tusks belonged to animals that came before modern mammals, called dicynodonts,” says Ken Angielczyk, a curator at Chicago’s Field Museum and an author of the paper. “They’re very weird animals.” (Read more.)


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