The nilgai is a living fossil that has barely changed in nine million years.

Nature · Published 30 September 2026 Swipe more like this →

In short: As the largest antelope in Asia, the nilgai is a biological outlier. While most antelopes belong to the gazelle tribe, the nilgai is a primitive survivor of the Boselaphini tribe. It is so distinct that Hindus consider it sacred, granting it the same protected status as domestic cattle.

The nilgai, or Boselaphus tragocamelus, is a unique taxonomic puzzle. While the term antelope is a broad catchall for over 90 species of ruminating ungulates, the nilgai belongs to the tribe Boselaphini, a group that includes only one other species, the four-horned antelope. Unlike the majority of Asian antelopes, which are gazelles, the nilgai is placed within the subfamily Bovinae, alongside cattle and the spiral-horned elands. This classification highlights its ancient lineage; fossil evidence suggests the tribe originated at least 8.9 million years ago, potentially representing the most primitive of all living bovids.

Evolutionary studies suggest the nilgai has changed very little since the early days of the family Bovidae. While modern nilgai females lack horns, their prehistoric relatives possessed them, and fossil records from the late Miocene show that boselaphines once roamed as far as Africa. Today, the nilgai is endemic to the Indian subcontinent, where it thrives in scrub forests and grassy plains. Its physical build—a sloping back, thin legs, and a distinct bluish-grey coat in males—is perfectly adapted for its diurnal, grazing lifestyle in open habitats.

The species is not only a relic of the past but also a resilient modern survivor. It is currently categorized as least concern on the IUCN Red List. Beyond its native range, the nilgai has demonstrated remarkable adaptability; introduced to Texas in 1924, it has established feral populations in the United States. Whether in the Indian Terai or the American scrubland, the nilgai remains a testament to a lineage that has persisted through the Pleistocene, having been hunted by humans as far back as the Mesolithic period.

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