Jaguar

The jaguar (Panthera onca) is the only big cat of the genus Panthera found in the Americas. Its coat ranges from pale yellow to tan, covered with spots that become rosettes on the sides; some individuals are entirely black due to melanism. Reaching up to 1.85 meters (6 feet 1 inch) in length and 158 kilograms (348 pounds), it is the largest cat in the Americas and the third largest globally. Its exceptionally strong bite allows it to crack turtle and tortoise shells, and it kills mammalian prey by biting directly through the skull between the ears.

Evolution

The jaguar’s ancestors likely crossed from Eurasia into the Americas during the Early Pleistocene via the Bering Strait land bridge. The oldest known fossils in North America date to between 0.85 and 0.82 million years ago. Today, its range stretches from the southwestern United States through Mexico, Central America, the Amazon rainforest, and south to Paraguay and northern Argentina.

It lives in various forested and open habitats, preferring tropical and subtropical moist broadleaf forests, wetlands, and wooded areas. An excellent swimmer, it is a solitary, opportunistic, stalk-and-ambush apex predator. As a keystone species, it helps stabilize ecosystems and control prey populations.

Threats

Threats include habitat loss and fragmentation, poaching for body parts, and killings due to conflict with humans, especially ranchers in Central and South America. Listed as Near Threatened on the IUCN Red List since 2002, its wild population is believed to have declined since the late 1990s. Conservation focuses on 51 large Jaguar Conservation Units, each containing at least 50 breeding individuals, across 36 geographic regions from Mexico to Argentina.

The jaguar holds a prominent place in the mythology of Indigenous peoples, including the Aztec and Maya civilizations.

Etymology

The word “jaguar” likely comes from the Tupi-Guarani yaguara, meaning “wild beast that overcomes its prey at a bound.” In Guyana, Indigenous peoples call it jaguareté, adding eté (“true”) to distinguish it from other animals called jaguar. “Onca” comes from the Portuguese onça for a spotted cat larger than a lynx; “panther” derives from Latin panthēra and Greek πάνθηρ. In North America, the word is pronounced with two syllables; in British English, with three.

Taxonomy

Carl Linnaeus first described the jaguar as Felis onca in 1758. In the 19th and 20th centuries, various type specimens led to descriptions of multiple subspecies. In 1939, Reginald Innes Pocock recognized eight based on geography and skull shape, though he doubted some. Later work suggested only three, and by 2005 nine were considered valid: P. o. onca (Brazil), P. o. peruviana (Peru), P. o. hernandesii (Mexico), P. o. palustris (Argentina, based on a fossil), P. o. centralis (Costa Rica), P. o. goldmani (Mexico), P. o. paraguensis (Paraguay), P. o. arizonensis (Arizona), and P. o. veraecrucis (Mexico).

Pocock placed the jaguar in Panthera and noted its morphological similarity to the leopard. Genetic and morphological research shows clinal north–south variation but no clear subspecific differentiation; DNA from 84 South American samples indicates high past gene flow in Colombia. Since 2017, the jaguar is considered a monotypic taxon, though Panthera onca onca is still distinguished from two fossil subspecies, P. o. augusta and P. o. mesembrina. However, a 2024 study suggests their validity remains unresolved due to considerable morphometric variation in both fossil and living jaguars.

The Panthera lineage diverged from other felids roughly 9.32 to 4.47 million years ago (or 11.75 to 0.97 million years ago). Some genetic analyses place the jaguar as a sister species to the lion, diverging 3.46 to 1.22 million years ago; others place the lion closer to the leopard. The jaguar’s lineage likely originated in Africa and spread to Eurasia 1.95–1 million years ago.