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Other artiodactyls include camels, cattle, deer and pigs, although hippopotamuses are not closely related to these groups. The Hippopotamidae are believed to have evolved in Africa; the oldest known hippopotamid is the genus Kenyapotamus, which lived in Africa from 16 to .

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Their skin secretes a natural sunscreen substance which is red-coloured.

The secretion is sometimes referred to as "blood sweat", but is neither blood nor sweat.

The authors found low, but significant, genetic differentiation among H. Three species of hippopotamus, the European hippopotamus (Hippopotamus antiquus), Hippopotamus major and Hippopotamus gorgops, ranged throughout continental Europe and the British Isles.

All three species became extinct before the last glaciation.

The common hippopotamus (Hippopotamus amphibius), or hippo, is a large, mostly herbivorous, semiaquatic mammal native to sub-Saharan Africa, and one of only two extant species in the family Hippopotamidae, the other being the pygmy hippopotamus (Choeropsis liberiensis or Hexaprotodon liberiensis).

The name comes from the ancient Greek for "river horse" ().Genetic analyses have tested the existence of three of these putative subspecies. Three species of Malagasy hippopotamus became extinct during the Holocene on Madagascar, one of them within the past 1,000 years.A study examining mitochondrial DNA from skin biopsies taken from 13 sampling locations, considered genetic diversity and structure among hippo populations across the continent. The Malagasy hippos were smaller than the modern hippopotamus, likely through the process of insular dwarfism.It is rarely found in deep water; when it is, the animal moves by porpoise-like leaps from the bottom.The testes of the males descend only partially and a scrotum is not present.The hippopotamus is among the most dangerous animals in the world as it is highly aggressive and unpredictable. A rough evolutionary lineage can be traced from Eocene and Oligocene species: Anthracotherium and Elomeryx to the Miocene species Merycopotamus and Libycosaurus and the very latest anthracotheres in the Pliocene.

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