A tiny South American marsupial that looks like a mashup of a mouse, a miniature opossum, and a little fuzzy athlete. It’s small enough to fit comfortably in one hand, with a pointed snout, large dark eyes made for night vision, and delicate ears that seem too big for its head in the cutest way. Its fur is usually soft and grayish to brownish, helping it blend into bark, dry leaves, and shadowy branches. But the real headline feature is its tail: the base can look noticeably thick or “fat,” because this animal stores extra energy there like a living pantry.

When most people hear “opossum,” they imagine a much larger, tougher-looking animal, but mouse opossums are in a different league—tiny, nimble, and much more like small forest hunters. The fat-tailed feature is especially distinctive because it signals a lifestyle that may include unpredictable food supplies. Instead of relying on a constant buffet, this little marsupial can build up reserves in the tail and draw on them when times get lean. It’s also more likely to be a branch-and-vine traveler than a ground wanderer, using quick climbs and careful leaps to move through shrubs and low trees.

The dwarf fat-tailed mouse opossum is mainly active after dark, searching for insects and other small prey, and it may also snack on fruit or nectar when it finds them. It uses smell and hearing to track food, pausing often to sniff and listen before making quick, precise grabs. Because it’s so small, it has to be smart about risk: moving quietly, staying close to cover, and freezing when danger is near. During the day, it usually hides in snug shelters such as tree hollows, thick tangles of plants, or sheltered nooks where it can stay warm and safe. Those hideouts are important not just for safety, but for saving energy—because a tiny body can lose heat fast.

Distribution

Country

Population est.

Status

Year

Comments

Brazil

NT

2016