Red Ruffed Lemur

About the red ruffed lemur

The red ruffed lemur is one of two species in the genus Varecia, the ruffed lemurs, alongside the black-and-white ruffed lemur. Like every lemur, it's found only on Madagascar, and its range there is unusually narrow: it occurs solely in the rainforests of the Masoala Peninsula in the island's northeast. It's also one of Madagascar's largest primates and, together with its sister species, the largest member of the family Lemuridae.

Adults measure about 21 inches in body length with a tail adding roughly another 24 inches, and weigh between 7.3 and 7.9 pounds; females run slightly larger than males. The species has slender bodies, long legs, and a narrow snout, with small ears that its long fur often hides. Its soft, thick coat is rust-red across the head, back, and body, while the stomach, tail, feet, and the insides of the legs are black. A white patch marks the back of the neck, and some individuals show additional white on the feet or around the mouth; a few also carry a white or pink patch on the back of the limbs or digits and a similarly colored ring at the base of the tail.

Grooming is a major part of red ruffed lemur life, both self-directed and social. The lower incisors grow forward and slightly spaced to form a toothcomb, and a specialized claw on the second toe of the hind foot assists as well — together, these adaptations let the species keep its long fur clean with the same care it invests in social bonds within its group.

Behavior and diet

Red ruffed lemurs are diurnal, most active in the morning and evening, and typically live in small, matriarchal groups of two to sixteen individuals, though gatherings of up to 32 have been recorded. Field studies also describe monogamous pairs in the species, suggesting its social structure is more flexible than a single fixed pattern. During the wet season, when food is abundant, groups will merge around a single food source and forage together; in the dry season they tend to split apart and search individually, which is unusual, since most other diurnal lemur species keep foraging in large groups year-round. Individuals stay in contact over long distances through loud, booming calls, and the Duke Lemur Center has recorded roughly twelve distinct calls in the species — notably, red ruffed lemurs and black-and-white ruffed lemurs understand each other's vocalizations despite living in different parts of Madagascar. Scent marking rounds out their communication.

Diet centers on fruit, especially figs, along with nectar and pollen; leaves and seeds fill in when fruit becomes harder to find. Reproduction follows a fixed seasonal pattern tied to Madagascar's dry and wet seasons: breeding happens toward the end of the dry season, from May to July, timed so that young arrive when food is more plentiful. After a notably short gestation of 102 days, a female may give birth to as many as six young, though litters of two or three are more typical — an unusual trait, since ruffed lemurs are the only primates known to have litters at all. Newborns are furred and can see but cannot move, so mothers keep them in elevated nests 33 to 66 feet above the forest floor, built from twigs, leaves, vines, and fur, until they're about seven weeks old. A mother can nurse up to six infants at once and, needing to move them individually before they can cling on their own, carries them one at a time; fathers stand guard at the nest in the days just after birth. Weaning happens at four months, but survival is precarious — an estimated 65% of young do not reach three months of age, often as a result of falls from the trees.

Range and habitat

The red ruffed lemur's entire known range is confined to the rainforests of the Masoala region in northeastern Madagascar. The creation of Masoala National Park in 1997 extended formal protection to part of that range, but many red ruffed lemurs live outside the park's boundaries and remain at high risk there.

Conservation status

The IUCN Red List classifies the red ruffed lemur as Critically Endangered, and recent studies describe a wild population that continues to decline. Logging, the burning of habitat, cyclones, mining, hunting, and the illegal pet trade are named as the primary threats, with illegal logging for valuable tropical hardwoods such as rosewood — a practice linked to political instability — having intensified since 2009 and further reduced available forest. Natural predators, including large snakes, eagles, and the fossa, add further pressure.

The captive population stands at 590 animals, managed under a Species Survival Plan through which participating zoos coordinate breeding and care; wild-caught individuals have also been introduced into that captive program to guard against inbreeding.