Derby’s Woolly Opossum

Identification

Derby's woolly opossum is the largest member of its genus, measuring 60–70 centimetres in total length and weighing 200–400 grams. Distinguished by its brown coat, white-buff to golden-brown underside, and characteristic white to pink ears, this arboreal marsupial is unmistakable in the field. A dark streak runs from the nose to the crown, and the prehensile tail—which comprises 58–67% of body length—is partially naked and invaluable for grasping branches. The tail's distinctive appearance and the animal's efficient climbing posture are key identification features.

Range & Habitat

This Central American species ranges from southern Mexico (Veracruz) southward through Guatemala, Honduras, Nicaragua, Costa Rica, and Panama, extending into South America to western Ecuador and the Cauca River valley of Colombia. It inhabits deciduous and moist evergreen forests, from lowland regions up to 2,600 metres elevation. Seven subspecies are recognized across this range, each showing slight geographic variation in coat colour and size.

Behaviour & Diet

Derby's woolly opossum is strictly nocturnal and solitary, spending daylight hours in nests constructed from dead leaves within tree cavities in the upper canopy. It is an exceptionally agile climber, moving with remarkable dexterity through vines and branches; the prehensile tail acts as a crucial grasping organ. When threatened, it may bite defensively or produce distress squeals. Activity levels increase when food becomes scarce and decrease when exposed to light.

The diet is omnivorous, consisting primarily of fruits from pepper vines and Cecropia species, supplemented by nectar from balsa trees and other flowering plants, as well as small invertebrates and vertebrates. After feeding, the animal meticulously grooms itself using its forepaws, cleaning the face, flanks, underbelly, and tail.

Best Time & Places to See It

As a strictly nocturnal species, Derby's woolly opossum is encountered only on night walks through suitable forest habitat. Search the upper canopy levels of deciduous and moist evergreen forests from Mexico to Colombia and Ecuador, particularly in protected reserves where forest cover remains intact. Breeding timing varies geographically, occurring during the dry season in Panama (late January–early February) but year-round in Nicaragua, though this does not significantly affect visibility. The species is classified as Least Concern with presumed large populations, though it remains challenging to locate due to its secretive, arboreal nocturnal habits.

Photography Tips

Photographing this species requires patience, night-vision capability, and a guide familiar with local populations. Use a headlamp with a red filter to minimize disturbance, as the animal's eyes glow distinctly red under light—a useful locating feature. Position yourself beneath suspected nesting cavities in large trees during night walks. A fast lens and high ISO are essential for low-light conditions. Capture the distinctive prehensile tail wrapped around branches and the animal's characteristic nose-to-crown dark streak. Wide-angle shots showing the opossum among vines and branches convey its remarkable arboreal agility and habitat preference.