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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.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4507235/
http://digitallibrary.amnh.org/bitstream/handle/2246/447/B279a07.pdf?sequence=20
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5936914/
https://www.ncbi.nlm.nih.gov/pubmed/26285033
https://www.researchgate.net/publication/267156822_Phylogenetic_systematics_of_the_Borophaginae_Carnivora_Canidae?enrichId=rgreq-d5b9b9334f3e7d5206bb87428d1dc7db-XXX&enrichSource=Y292ZXJQYWdlOzI2NzE1NjgyMjtBUzoxNTQ5NTc4MzE0NzkyOTZAMTQxMzk1NjIzNDUyOA%3D%3D&el=1_x_2&_esc=publicationCoverPdf
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5963924/
https://www.cambridge.org/core/journals/journal-of-paleontology/article/borophagine-canid-carnivora-canidae-borophaginae-from-the-middle-miocene-chesapeake-group-of-eastern-north-america/FBD12E2AB04E6AADB367A0FE36C4A3D9
http://www.naturalhistorymag.com/htmlsite/0708/0708_feature.html
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