It also has giraffes, zebras, lions, tigers, white rhinoceroses, and baboons. Examples of perissodactyl mammals are horses, rhinoceroses and tapirs. Thanks to genetic studies, elephants, rhinoceroses and hippopotamuses are classified as separate clades altogether. Among the findings were the remains of cave lions, rhinoceroses, straight-tusked elephants and hippopotami. Rhinoceros is a genus comprising one-horned rhinoceroses. The Northern Sumatran rhinoceros was the most widespread of the Sumatran rhinoceroses. There are exhibits for Grant's zebras, Black wildebeest, Ostrich, Rothschild's giraffes, and White rhinoceroses. Grasslands allow for more grazers, such as horses, rhinoceroses, and hippos. The African Queen featured live animals, including alligators, crocodiles, rhinoceroses and spider monkeys. This means that horses share a common ancestry with tapirs and rhinoceroses. NPC enemies include savannah and delta fauna such as crocodiles, hyenas, rhinoceroses, and more. They occur in several species, including mice, ferrets, rhinoceroses, and even-toed ungulates and produce pheromones. The plural in English is "rhinoceros" or "rhinoceroses". Like all rhinoceroses, elasmotheres were herbivorous. Among them were animals resembling giant pigs, rhinoceroses, and titanotheres.