Guianan white-eared opossum

Has “handy” back feet, including a thumb-like toe that helps it grip branches like a natural climber’s glove

Tania Marisol González, Nathalia Moreno-Niño, Eduardo Molina, Dolors Armenteras – González, T. M., Moreno-Niño, N., Molina, E., & Armenteras, D.

Has “handy” back feet, including a thumb-like toe that helps it grip branches like a natural climber’s glove

Population

A tough little nighttime wanderer from the Guiana Shield region of northern South America, and it wears its best ID badge right on its head: pale, whitish ears that stand out against a darker face. It has the classic opossum look—pointed snout, bright eyes, and a tail that’s mostly bare and scaly—plus a sturdy, “built to scramble” body for climbing and clambering through branches, vines, and messy forest edges. Its coat is usually gray to dark gray-brown, with a lighter underside, a coloring that makes it blend into bark and shadows. When it moves, it’s less about speed and more about careful confidence: a stop to sniff, a pause to listen, then a quiet climb or a soft-footed trot along a fallen log.

Many people think “opossum” and picture the North American Virginia opossum, but this is a South American species with a much more limited home base. In fact, among its close Didelphis relatives, it’s known for having one of the smallest ranges, tied largely to the Guiana Shield and nearby areas. It also overlaps in the “look-alike” category with other opossums that may have pale ears or similar gray coats, so its combination of location, ear color, and overall “forest-shadow” look becomes important. In places where several opossum species can occur, this one often feels like the local specialist—more associated with the Guianas’ forest belt than the wide-ranging, everywhere-at-once reputation some other opossums have.

In daily life, it’s an adaptable eater with a practical attitude: fruit when it’s available, insects and other small prey when it can catch them, and plenty of opportunistic snacking if something easy turns up. That flexible menu helps it survive in changing conditions, from thick forest to edges near people, as long as there’s cover to retreat into. It’s mostly active from dusk through the night, using smell and hearing to navigate a world that’s more about rustles than views.

Distribution

Country
Population est.
Status
Year
Comments
Brazil
2015
French Guiana
2015
Guyana
2015
Suriname
2015
Venezuela
2015

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Terrestrial / Aquatic

Altricial / Precocial

Polygamous / Monogamous

Dimorphic (size) / Monomorphic

Active: Diurnal / Nocturnal

Social behavior: Solitary / Pack / Herd

Diet: Carnivore / Herbivore / Omnivore / Piscivorous / Insectivore

Migratory: Yes / No

Domesticated: Yes / No

Dangerous: Yes / No