Black wildebeest
The black wildebeest or white-tailed gnu ("Connochaetes gnou") is one of the two closely related wildebeest species. It is a member of the genus "Connochaetes" and family Bovidae. It was first described in 1780 by Eberhard August Wilhelm von Zimmermann. The black wildebeest is typically in head-and-body length, and the typical weight is . Males stand about at the shoulder, while the height of the females is . The black wildebeest is characterised by its white, long, horse-like tail. It also has a dark brown to black coat and long, dark-coloured hair between its forelegs and under its belly.
Northwestern wolf
Northwestern wolves are one of the largest subspecies of wolves. In British Columbia, Canada, five adult females averaged and ten adult males averaged , with a weight range for all adults of . In Yellowstone National Park, adult females were reported to average and adult males averaged reportedly , with a mean adult body mass in winter of . Based on known reported adult average body masses, this would make the northwestern wolf the largest-bodied wolf subspecies, in comparison the mean adult weights of its two nearest rivals in size, the Eurasian wolf ("C. l. lupus") and the Interior Alaskan wolf ("C. l. pambasileus"), was reported as and , respectively. Sir John Richardson described the northwestern wolf as having a more robust build than the European wolf, with a larger, rounder head and a thicker, more obtuse muzzle. Its ears are also shorter, and its fur bushier.