[8] Equus first appeared in South America during the late Early Pleistocene-earliest Middle Pleistocene, around 1 to 0.8 million years ago, based on remains found near Tarija, Bolivia.

[11] A 2019 study suggested that Equus neogeus specimens from Uruguay were primarily grazers that fed on both C4 and C3 grasses in prairies and open woodlands.

[13] The youngest remains date to approximately 11,700 years Before Present (BP), in Río Quequén Salado, in the southwest of Buenos Aires province, Argentina.

[14] At the Paso Otero 5 site in the Pampas of northeast Argentina, Fishtail points are associated with burned bones of Equus neogeus and other extinct megafauna.

[16] At the Arroyo Seco 2 site in the Argentinian Pampas, which has multiple episodes of human activity dating to between 14,782 and 11,142 cal yr BP remains of Equus neogeus (alongside those of other megafauna) are associated with human artifacts and exhibit fracture marks indicative of butchery.