Makucha is a wandering Hyaenodon who goes "where the road takes him." He is shown to be very taciturn and not forthcoming of his past. He first appears
Hyaenodon translates into "hyena tooth" even though the animal is nowhere near related to any feliforms, or any of the modern carnivores. However, they were more dangerous. One of the features that differentiate Hyaenodon from hyenas is size. The genus Hyaenodon has several species all ranging in size. The largest species, H. gigas, is one of the largest terrestrial mammalian carnivores ever discovered. This species measured 6 meters (20 ft) in length and weighed a total of 500 kg (1,100 lb). On the contrary, the two species H. microdon and H. mustelinus weighed 100 times less than H. gigas, the species in the show.
Hyaenodon was an apex predator. This animal preyed on the bizarre group of animals called chalicotheres, newborn or juvenile indricotheres, bear-dogs and a large, omnivorous relative of pigs and wild boars, the Entelodonts. Its sheer size and meat-shearing teeth would make a deadly combination, making it an efficient and successful predator. However, like most other early carnivorous mammals, Hyaenodon wasn't the brightest of animals.
Next to large creatures such as an indricothere, Hyaenadon may have looked small, but they were as big as rhinos, and were easily capable of killing an indricothere calf, if they could get pass the mothers. Hyaenadon have a bone-shattering force of over 1,000 pounds per square inch.