Southern Black-eared Opossum or Large-eared Opossum (Didelphis aurita)

Classification

The Southern Black-eared Opossum (Didelphis aurita), also known as the Large-eared Opossum, Big-eared Opossum, Brazilian Common Opossum, or Gambá, is a marsupial belonging to the family Didelphidae, the largest family of New World opossums. Its scientific classification is: Kingdom Animalia, Phylum Chordata, Class Mammalia, Order Didelphimorphia, Family Didelphidae, Genus Didelphis, and Species D. aurita. The species was first described by Prince Maximilian of Wied-Neuwied in 1826. [mammaldiversity.org], [itis.gov]

For many years, the Southern Black-eared Opossum was considered closely related to, or even the same species as, the Northern Black-eared Opossum (Didelphis marsupialis). However, detailed morphological and genetic studies confirmed that D. aurita is a distinct species associated primarily with the Atlantic Forest region of eastern South America. [SOUTHERN B...A PARAGUAY], [mammaldiversity.org]

General Description

The Southern Black-eared Opossum is a relatively large opossum with a head-and-body length of approximately 31 to 39 centimetres, a tail measuring 31 to 37 centimetres, and a weight ranging from 0.7 to 1.9 kilograms. Males are significantly larger than females. It possesses coarse grey to black fur over a yellowish undercoat, giving the animal a somewhat grizzled appearance. A distinctive black stripe runs down the centre of the forehead, and black fur surrounds the eyes, creating a mask-like pattern. [treatment.plazi.org], [animaldiversity.org]

One of its most recognisable features is its large, naked, black ears, which give rise to both its common names. The tail is prehensile and functions as an extra limb when climbing. The base of the tail is furred, while the remainder is mostly hairless and coloured black near the body and white toward the tip. Like other opossums, females possess a pouch in which they carry and nurse their young after birth. [treatment.plazi.org], [animaldiversity.org]

The species is highly adaptable and omnivorous. Its diet includes insects, spiders, small vertebrates, eggs, carrion, and a wide variety of fruits. This flexibility allows it to exploit a broad range of habitats and food resources. Because it consumes both animals and fruit, it acts as both a predator and a seed disperser within its ecosystem. [treatment.plazi.org]

Distribution

The Southern Black-eared Opossum is native to eastern and southeastern Brazil, southeastern Paraguay, and northeastern Argentina, particularly within the Atlantic Forest biome. It is one of the most characteristic marsupials of this biodiversity hotspot. [mammaldiversity.org], [animaldiversity.org], [treatment.plazi.org]

Its preferred habitat includes Atlantic rainforest, secondary forest, Araucaria forests, forest fragments, and associated vegetation types. However, the species is remarkably tolerant of habitat disturbance and frequently inhabits areas modified by humans, including agricultural landscapes, suburban environments, and fragmented forests. This adaptability has enabled it to persist in regions where much of the original forest has been cleared. [treatment.plazi.org], [animaldiversity.org]

Although strongly associated with forested habitats, the Southern Black-eared Opossum can be found from coastal lowlands to upland forests at elevations approaching 1,000 metres. It is equally comfortable foraging on the ground and climbing through trees. [animaldiversity.org], [treatment.plazi.org]

Interesting Facts

The Southern Black-eared Opossum is one of the most adaptable marsupials in South America. It is capable of thriving in highly disturbed habitats, making it one of the few native mammals that often flourishes in urban and suburban environments. In many Brazilian cities, it is commonly encountered in gardens, parks, and forest remnants. [treatment.plazi.org], [animaldiversity.org]

Like other opossums, this species has a very unusual reproductive strategy. After a short gestation, tiny underdeveloped young crawl into the mother's pouch, where they continue their development while attached to a nipple. Later, older juveniles may ride on their mother's back as she moves through the forest. [animaldiversity.org]

The species is primarily nocturnal and solitary. It has an excellent sense of smell and uses its prehensile tail and climbing ability to access food in trees as well as on the ground. Its opportunistic feeding habits help it survive seasonal changes in food availability. Because it consumes fruits from numerous plant species, it also plays an important role in seed dispersal and forest regeneration. [treatment.plazi.org], [animaldiversity.org]

Conservation Status and Threats

The International Union for Conservation of Nature (IUCN) currently classifies the Southern Black-eared Opossum as Least Concern. This designation reflects its broad distribution, large population, and remarkable ability to adapt to habitat disturbance and human activities. [mammaldiversity.org], [ecoregistros.org]

Despite its secure conservation status, the species still faces several local threats. Ongoing deforestation within the Atlantic Forest continues to reduce and fragment suitable habitat. Road mortality is common, particularly in urban and suburban areas where opossums frequently cross roads while foraging at night. They may also be killed by domestic dogs or persecuted by humans who mistakenly regard them as pests. [animaldiversity.org], [treatment.plazi.org]

Fortunately, the Southern Black-eared Opossum's adaptability has allowed it to remain widespread even within heavily modified landscapes. Conservation of remaining Atlantic Forest habitats and wildlife corridors will benefit this species and the many other animals that depend on one of the world's most threatened forest ecosystems. As a resilient omnivore, seed disperser, and important component of forest food webs, Didelphis aurita continues to play a valuable ecological role throughout its range. [treatment.plazi.org], [mammaldiversity.org]