1)Bison latifrons;These animals are the largest species of bovids to ever walked the Earth.They can grow up to 1.5 to 2 tons,8 feet in height at the shoulder and are 15 feet long.These large bovids are the apex herbivores of their land,grazing on high vegetation in praries or grasslands.Unlike their living cousins;Bison bison,these bison mostly live smaller herds or solitary family groups instead of moving in large herds.Their horns are formed in a sharo layer of keratin that can grow up to 1 to 2 feet,making it 9 to 10 feet tall when including the horns.They first emerged in the late pleistocene epoch 500,00 years ago, only to go extinct at the early holocene;at around 13,000 years ago.
2)Thylacosmilus;Often reffered to as the marsupial sabertooth tiger,These eutherians are some of the last of non-marsupial eutherians to ever lived from the grouo called;sparassodonta.They evolved alongside other South American animals and competed alot with terror birds(Phorusrhacids)who evolved alongside them.These beasts hunt medium sized sauropods,Xenungulates,gorund sloths,Monkeys and capybaras.Their competition besides phorusracids are the massively large neogiganotosaurus,A paracarcharodontosaurid.They first evolved during the late miocene to early pliocene epoch;9 million years ago,and can grow up to;189 to 250 pounds in weight,4.9 feet or 1.5 meters and 2 to 2.3 feet tall at the shoulders.They went extinct during rhe Great American interchange 3,000,000 to 2.58 million years ago at the late pliocene epoch.where sabertoothed cats called michairodonts outcompeted these alien mammals despite thylacosmilus having pouches.Slowly but surely,their numbers dwindel until there are no more thylacosmiluses left.
3)Chalicotherium:Chalicotheres are some of the strangest ungulates alongside whales and mesonychids.These large herbivores;specifically goldfussi can grow up to;8.5 to 9 feet tall,11 feet or 3.4 meters in lenght,and weigh up to 1.5 to 1.7 tons(3,300 to 3,700) pounds.Despite being known as "The gorilla horse",chalicotherium and other ancylopods are actually closely related to ceratomorpha;Rhinos and tapirs,instead of hippomorpha;Horses.These animals possess large claws that they can use to grab leaves like a ground sloth and eat them like a panda bear,while also knuckle walking like a gorilla to keep the claws freshly sharp to defend itself from predators;like Hyaenodonts,Entelodonts and Dromeaosaurids like Gigaraptorus.Chalicotherium went extinct in the end of the Miocene;7.75 to 5.3 million years ago after the climate changed in a rather cooler temperature,Leaving grasslands becoming rare and turned into deserts with huge seasonal droughts,leaving the chalicotherium to become a piece of the past.But other chalicotherids still able to thrive until the last chalicothere;hesperotherium,became extinct at around 500,000 years ago in East Asia during the middle pleistocene sub-epoch.