Suggested identities range from a mythological creature to an elephant, hippopotamus, rhinoceros, or buffalo. Pygmy hippos share the same general form as a hippopotamus. High Evolutionary had a part in turning an ordinary zoo hippopotamus into the Hippo. Mammals include elephants, gorillas and hippopotamus. The drawings include those of giraffe and hippopotamus. The Gow were hunters and specialized in hunting river animals such as crocodile and hippopotamus. The hippopotamus and pygmy hippopotamus are the whale's closest terrestrial living relatives. The animals were very similar to the extant hippopotamus and pygmy hippopotamus. The river above the falls contains large populations of hippopotamus and crocodile. Its body shape and lifestyle demonstrate convergent evolution with pigs, tapirs, and the pygmy hippopotamus. Several folktales have been collected about the pygmy hippopotamus. The Nigerian pygmy hippopotamus was never studied in the wild and never captured. Amulets in the shape of animals such as the antelope and hippopotamus have been found. The ancestral form of the pygmy hippopotamus may be the genus "Saotherium".