Hippidion (name meaning: "Little Horse") is a genus of equine that lived in South America from the Late Pliocene to the end of the Late Pleistocene, between two million and 11,000 years ago. They were one of two lineages of equines native to South America during the Pleistocene epoch, alongside those of the Equus subgenus Amerhippus.
In the Series 3 episode "Saving the Sabre Tooth," a herd of a dozen Hippidion and their babies were brought to the park from Early Pleistocene South America, 1 million years ago. They reside in the Giraffe Grasslands Enclosure.