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| | Comparative Placentation |
 | | Hippopotamuses belong to the suborder Suina, a varied group of artiodactyls that were summarized aptly by Macdonald and Bosma (1985) thus: "Apart from a number of extinct groups, the artiodactyl suborder Suina comprises the families Suidae (pigs), Tayassuidae (peccaries) and Hippopotamidae (hippopotami) (Romer, 1966). |
 | | Hasegawa and Adachi (1996) were critical of this analogy, and Nomura and Yasue (1999) further pursued the taxonomic relations. |
 | | Rouille, Y., Chauvet, M.T., Cauvet, J., Acher, R. and Hadley, M.E.: The distribution of lysine vasopressin (lysipressine) in placental mammals: a reinvestigation of the Hippopotamidae (Hippopotamus amphibius) and Tayassuidae (Tayassu angulatus) families. |
| medicine.ucsd.edu /cpa/hippo.html (4555 words) |
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