One of South America’s toughest neighborhoods: the Dry Chaco of Argentina, a land of thorny shrubs, dusty ground, and long stretches where water and shade can feel like rare prizes. It has a “mouse opossum” look—small body, pointed snout, big dark eyes, and nimble feet—but its most memorable feature is its tail. The tail is thicker at the base than you’d expect for such a small animal, because it can store extra energy there like a portable pantry. Its coat is usually gray-brown to brownish, practical coloring for blending into bark, leaf litter, and the dim light of scrubby woodland.

For a long time, it was lumped in with the better-known “common fat-tailed mouse opossum,” but closer study revealed distinct differences and warranted its own name. In other words, it’s not just a local version of a widespread animal—it’s a Dry Chaco specialist. That matters because it shapes everything about its life: it’s adapted to an environment where heat, dryness, and sudden seasonal changes can rewrite the rules overnight.

Daily life for this little opossum is a mix of hunting, foraging, and smart energy budgeting. After dark, it becomes a careful explorer of branches, shrubs, and ground-level tangles, using sharp smell and hearing to find food. The menu is flexible—often insects and other small prey, plus fruit or whatever else is available—because in a dry, seasonal habitat, being picky can be a bad strategy. It tends to keep close to cover, freezing when startled and relying on stillness as much as speed. And even though it’s tiny, it’s surprisingly capable: nimble hands and feet help it climb and grab, and that tail isn’t just storage—it also helps with balance when it moves through uneven, thorny terrain. When daylight returns, it usually retreats to a snug hideout, conserving energy like a camper waiting out the heat.

Distribution

Country

Population est.

Status

Year

Comments

Argentina

2016