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A huge and diverse subfamily of dogs, the bone-crushers patrolled North America for more than thirty million years, before they disappeared in the not-too-distant past. So what happened to the biggest dogs that ever lived?
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References:
Dogs: Their Fossil Relatives and Evolutionary History by Xiaoming Wang & Richard H. Tedford.
The Princeton Field Guide to Prehistoric Mammals by Donald Prothero.
Evolution of Tertiary Mammals in North America, Volume 1: Terrestrial Carnivores, Ungulates, and Ungulatelike Mammals edited by Christine M. Janis.
The Skeleton of the Borophaginae (Carnivora, Canidae): Morphology and Function by Kathleen Munthe.
Vertebrates: Structures and Functions by S.M. Kisia.
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