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.
Great bustard
The huge adult male great bustard is amongst the heaviest living flying animal. It is also arguably the most sexual dimorphic extant bird species, in terms of the size difference between males and females. Going on mass, the only known bird with a higher dimorphism is the green peafowl ("Pavo muticus") as the males are apparently near four times as heavy as the female. Among both bustards and all living birds, the upper reported mass of this species is rivaled by that of the kori bustard ("Ardeotis kori"), which, due to its relatively longer tarsi and tail, is both longer and taller on average and is less sexually dimorphic. In terms of weight ranges reported, the great Indian bustard ("Ardeotis nigriceps") also only lags slightly behind these species. A male is typically tall, with a length of around and has a wingspan. The male can range in weight from . Average male weights as reported have been fairly variable: in Russia, males weighed a median of ; in Spain, males weighed a mean of during breeding season and during non-breeding; in Germany, males weighed a mean of ; and the Guinness World Records has indicated that prior to their extirpation male bustards in Great Britain weighed an average of . Average weight of males is almost an exact match to that of male Kori bustards. Among all flying animals and land birds, male Andean condors ("Vultur gryphus") may match or exceed the mean body masses of these male bustards but not their maximum weights. Furthermore, male swans of the two largest species (trumpeter and mute) may attain a similar average mass depending on season and region. In a study in Spain, one male weighed as much as . The heaviest verified specimen, collected in Manchuria, was about . Larger specimens have been reported but remain unverified.