Jaguar

The jaguar is the apex predator of the American tropics — a compact, immensely powerful cat that hunts on land and in water and dispatches prey with a method no other big cat uses.

Overview

Jaguars are the third-largest cat in the world, after the tiger and lion, and by far the largest in the Western Hemisphere. Their heartland is the Amazon Basin and the vast seasonal wetland of the Pantanal in Brazil, Bolivia, and Paraguay, where dense forest, slow rivers, and abundant prey let them reach their greatest size. A handful still cross into the mountains of the southwestern United States.

Physical characteristics

Where a leopard is lithe, a jaguar is a bruiser: deep-chested, thick-limbed, with a large blocky head. The golden coat carries rosettes with spots inside them, and the melanistic “black panther” form turns up regularly in rainforest populations.

The jaguar’s defining feature is its skull and jaw. Short and broad, packed with muscle, it produces the strongest bite of any big cat for its size — around twice the force of a lion, pound for pound.

Diet and hunting

Jaguars are opportunists with a recorded prey list of nearly 90 species. Favourites include capybara (the world’s largest rodent), collared and white-lipped peccaries, marsh and brocket deer, and, distinctively, caiman, turtles, and fish taken in and around water.

The hunting style is ambush: a stalk through cover, a short charge, and a bite delivered straight through the temporal bones of the skull, killing prey outright. It is the only big cat that routinely kills this way, and it lets the jaguar tackle armoured animals that would defeat a throat bite.

Behaviour

Jaguars are solitary and hold large territories marked with scent, scrapes, and a distinctive series of grunting roars called saw-wahs. They are most active around dawn and dusk but will hunt at any hour. Unlike most cats they are entirely comfortable in water — swimming across rivers, wading through flooded forest, and diving after prey.

Reproduction and life cycle

There is no fixed breeding season in the tropics. After a pregnancy of about 100 days, a female gives birth to one to four cubs in a sheltered den and raises them alone. Cubs stay with her for up to two years, learning to hunt, before establishing territories of their own. Adult jaguars have no natural predators; cubs are vulnerable to caimans, anacondas, and adult male jaguars.

Threats and conservation

The jaguar is Near Threatened with a decreasing trend. The pressures are concentrated at the edges of its range and along the expanding agricultural frontier:

• Deforestation for cattle pasture and soy, which removes habitat and cuts populations off from one another.
• Conflict with ranchers, who shoot jaguars that take calves.
• Illegal trade — a growing market, particularly in Asia, for jaguar fangs, skins, and skulls.

Large protected areas and cross-border “jaguar corridors” from Mexico to Argentina are the core of the conservation strategy, aimed at keeping the remaining populations connected.