Articulotherium

Articulotherium is an extinct hoofed mammal part of the early horse family that lived in what is now Europe during the early-to-middle Eocene period. It was about the size of a black rhinoceros in life and was also a sleek animal, with a long body, four hoofed toes on each feet, and a long muzzle filled with strong and sharp teeth with some flat molars in the back of its jaw. It is most often credited as the only carnivorous horse on Earth, preying on animals as big as a medium-sized dog, but while it is true that it fed on various prey animals, it probably fed on some plants too, in a manner similar to modern bears and pigs. It was most likely a solitary animal, only meeting other animals of its own species in order to breed. It is unknown on why Articulotherium became extinct, but it is likely that climate change replaced Articulotherium's forest home with open spaces, or it was outcompeted to extinction by the newly evolving Hyaenodonts and true carnivoran mammals.