Genetics has now shown that rhinos, hippos, and elephants are not closely related to each other. Rhinos are closely related to tapirs, but both rhinos and tapirs are much more closely related to horses than to hippos or elephants.
Family[change | change source]
Elephants, rhinoceroses and hippopotamuses are classified as separate clades altogether. Rhinos, hippos, pigs, peccaries, horses, zebras, donkeys and tapirs are classified in clade Laurasiatheria, while elephants, hyraxes, manatees and dugongs are classified in clade Afrotheria.
References[change | change source]
- Zhou, Xuming et al 2011. Phylogenomic analysis resolves the interordinal relationships and rapid diversification of the laurasiatherian mammals. Systematic Biology 61 (1): 150–164. 
- Nery M.F. et al 2012. Resolution of the laurasiatherian phylogeny: evidence from genomic data. Molecular Phylogenetics and Evolution 64 (3): 685–689. 
- Seiffert, Erik R (2007). "A new estimate of afrotherian phylogeny based on simultaneous analysis of genomic, morphological, and fossil evidence". BMC Evolutionary Biology. 7 (1): 224.