Intertaxon relationships
species
Hippopotamus
Hippopotamus amphibius Linnaeus, 1758
Crocuta crocuta (Erxleben, 1777) - Spotted Hyena 
Panthera leo (Linnaeus, 1758) - Lion
Cosmiomma hippopotamensis (Denny, 1843)
Dipetalonema hippopotami Leiper, 1910
Placobdelloides jaegerskioeldi Johansson, 1909