They are most closely related to the tenrecs of Madagascar. RBP3 orthologs have been identified in most eutherians except tenrecs and armadillos. Otter shrews are most closely related to the tenrecs of Madagascar. Like all other tenrecs, it is endemic to Madagascar. They are carnivorous, feeding mostly on small lemurs and tenrecs. They brought to Madagascar the ancestors of its tenrecs, lemurs, carnivorans and nesomyine rodents. Oryzorictinae is a subfamily of tenrecs endemic to the island of Madagascar. The molars are zalmbdodont (have v-shaped crest) like tenrecs. It and the tenrecs are Madagascar's only extant afrotherians. The tenrecs crack the shell into large pieces. The closest living relatives of the aardvark are the elephant shrews, tenrecs and golden moles. The majority of tenrecs, around 30 species, are found in Madagascar. For example, web-footed tenrecs ("Limnogale mergulus") resemble river otters in appearance and behaviour. The golden moles, otter shrews and tenrecs are part of this clade. The tenrecs are another group of mammals characteristic of Madagascar.