Horse
Besides the horse, there are six other species of genus "Equus" in the Equidae family. These are the ass or donkey, "Equus asinus"; the mountain zebra, "Equus zebra"; plains zebra, "Equus quagga"; Grévy's zebra, "Equus grevyi"; the kiang, "Equus kiang"; and the onager, "Equus hemionus".
Egernia
It is the namesake genus of the "Egernia" genus-group, which also includes the Solomon Islands skink ("Corucia"), "Cyclodomorphus" and the blue-tongued skinks ("Tiliqua"). In some older works, it is considered closely related to "Mabuya", but even among the subfamily Lygosominae this genus does not seem to be particularly closely related and would—were the genus-groups treated at the rarely used rank of infrafamily—certainly constitute an infrafamily of its own. On the other hand, the enigmatic crocodile skinks ("Tribolonotus") might be a very basal member of the "Egernia" genus-group.