Big-eared Opossum (Didelphis aurita) lives in tropical rainforest across South America. It feeds on insects and fruit. Its conservation status is Least Concern.
Fascinating facts about the Big-eared Opossum
- Big-eared opossums roam the Atlantic rainforests from Brazil's coast up into northeastern Argentina and southeastern Paraguay, living where the mean annual temperature swings between 17 °C and 24 °C and rainfall pours 1,350-2,000 mm each year. Their world splits into a warm, rainy stretch from September to March and a cooler, dry spell from April to August, a rhythm that drives everything from food availability to breeding. This seasonal pulse means the animals must be ready to hunt fruit in the wet months, tying their survival to the forest's climate clock.
- Male big-eared opossums can tip the scales at up to 1,880 g, while females stay lighter at 1,300 g during the breeding rush, a size gap that mirrors their different roles: larger males roam farther to chase mates, whereas smaller females guard tighter, resource-rich patches.
- A female's home range shrinks to as little as 0.6 ha when she's nursing, but expands to 1.7 ha in the off-season, while a roaming male stakes claim to up to 2.7 ha. By compressing their space during lactation, mothers protect their pouch-bound young; males, by contrast, need larger territories to sniff out multiple females.
- Breeding kicks off with the rains in July and stretches to March, letting mothers raise 2-3 litters, each averaging about seven joeys, while fruit is plentiful. Gestation lasts a brief 14 days, then the newborns cling to a nipple for up to 100 days before venturing out, a timeline that syncs the young's growth with the peak food supply.
- Around a quarter of big-eared opossums (26 %) host the tick Ixodes didelphidis, a parasite that can carry Lyme-disease agents to humans. Their role as preferred hosts.
Sources
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At a glance
RangeSouth America
HabitatTropical rainforest
DietInsects and fruit
About the Big-eared Opossum
In the twilight depths of the South American forest, the big-eared opossum emerges, its oversized ears twitching like satellite dishes, tuning into the subtlest whispers of the night. With an air of quiet purpose, it pads through the underbrush, its prehensile tail grasping and releasing branches as it navigates the dense thicket with an uncanny ease. As it moves, its large, round eyes shine like lanterns in the dark, illuminating a world of hidden wonders and ancient secrets.
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