Many animals have tusks, from elephants to walruses to hyraxes. But one thing tusked animals have in common is that they鈥檙e all mammals 鈥 no known fish, reptiles or birds have them. But that was not always the case. In a study published Oct. 27 in the Proceedings of the Royal Society B, a team of paleontologists at Harvard University, the Field Museum, the 黑料老司机 and Idaho State University traced the first tusks back to dicynodonts 鈥 ancient mammal relatives that lived before the dinosaurs.




































