Few people know that there are actually two kinds of hippos; there is the big, nasty, extremely dangerous classic hippo Hippopotamus amphibius, which gets to appear a lot in Animal Planet, and there is the Pygmy Hippo, which is seldom seen in the wild, let alone filmed or photographed. Most of what is known of them comes from captive specimens. Just like the Okapi, the Pygmy Hippo was unknown to science until recently (in this case, the 19th century). They look like smaller, cuter versions of the larger hippo, but they have somewhat different habits; for a start, they spend more time on land and live alone or in small groups, instead of gathering in huge herds like their larger relatives. They are only found in the rainforests and swamps of Western Africa.