Kalmar "Family Hippopotamidae" tana nufin dangin taxonomic na manya, dabbobi masu shayarwa na ruwa waɗanda suka haɗa da hippopotamus na kowa (Hippopotamus amphibius) da hippopotamus pygmy ( Choeropsis libereensis). Wannan iyali na cikin tsari na Artiodactyla, wanda ya haɗa da ungulates masu yatsa kamar barewa, tururuwa, da alade. Mambobin dangin Hippopotamidae an san su da girman girmansu, jikinsu masu siffa da ganga, da gajerun ƙafafu, da kuma abincin su na ciyawa da salon rayuwa na ruwa. Suna asali ne a Afirka kuma ana samun su a cikin koguna, tafkuna, da fadama a duk faɗin nahiyar.