The range of the southern opossum extends from eastern Mexico to northeastern Argentina (Redford and Eisenberg, 1992).
Biogeographic Regions: neotropical (Native )
There is considerable color variation in southern opossums. Generally there are varying degrees of black in the dorsal pelage, while the ventral side is white. This species is similar to D. albiventris, but has a darker dorsal pelage and black ears. Females are generally smaller than males (Cerqueira, 2000). The length of the head and body ranges from 263mm to 430 mm, with a tail length ranging from 295mm to 450 mm (Elizondo, 1999). Males are larger than females.
Range mass: 0.6 to 2.4 kg.
Range length: 263 to 450 mm.
Average basal metabolic rate: 3.31 W.
Habitat and Ecology
This species has been reasonably well studied in the northern portion of its range. It is nocturnal, arboreal, and usually solitary, although two or more may be encountered together during the breeding season when males actively court females. The females build a leaf nest in a tree cavity or burrow. Litter size varies with latitude, with smallest litters near the equator. Gestation period takes fourteen to fifteen days (Eisenberg, 1989). Given adequate shelter and a sustained food supply, the home range of a lactating female may be rather stable, but the animals are opportunistic feeders and readily shift home ranges to adapt to fluctuating resources. Mean Home-range ranged up to 123 ha for males, and to 16 ha for females. This species can be sympatric with D. albiventris in southeastern Brazil.
Didelphis marsupialis tolerates a variety of habitat types including primary and secondary forests, coffee plantations, urban and suburban area (Elizondo C, 1999), but are not found at elevations above 2,232 m or in arid regions. Didelphis marsupialis is replaced by its close relative, Didelphis albiventris (white-eared Opossum), in montane regions of northern South America (Eisenberg, 1989).
Range elevation: 2,232 (high) m.
Habitat Regions: tropical ; terrestrial
Terrestrial Biomes: forest ; mountains
Other Habitat Features: urban ; suburban ; agricultural
Southern opossums are omnivorous and will eat a large variety of food. In captivity they especially like bananas. They are opportunistic feeders and will readily shift home ranges in search of food. Feeding habits of males and females do not differ significantly, but there are differences in food preferences between young and old. Younger individuals primarily consume invertebrates, fruits, and plant remains, whereas older individuals consume all of these, as well as mammals and birds.
Foods eaten include: insects, frogs, birds, small mammals, earthworms, fruits and plant remains.
(Cordero and Nicolas, 1987)
Animal Foods: birds; mammals; amphibians; insects; terrestrial worms
Plant Foods: fruit
Primary Diet: omnivore
Didelphis marsupialis plays an important role in food webs. Because of its feeding habits, this species is likely to be important in controlling populations of small mammals and invertebrates. Because it is a prey species, it also plays an important role in regulating populations of owls and small, mammalian carnivores.
The most well-known adaptation for evading predators is known as "playing dead" or "playing opossum." An opossums will lie on its side as if dead with its tails rolled up, eyes and mouth open, and its paws partially closed. (Parker, 1990) Common predators of southern opossums include owls, snakes, and mammalian carnivores.
This list may not be complete but is based on published studies.
Known prey organisms
This list may not be complete but is based on published studies.
Life History and Behavior
These animals probably do not live that long in the wild. It has been reported that they usually live about two years in their natural habitat, but they can live up to seven years in captivity.
Status: wild: 2 years.
Status: captivity: 7 (high) years.
Status: captivity: 4.2 years.
Lifespan, longevity, and ageing
Males mark territories more heavily with saliva prior to the breeding season. Females construct leafy nests for their new families. (Eisenberg, 1989; Eisenberg and Redford, 1992) Mating is most likely polygynous, with males mating those females present in their territories.
Mating System: polygynous
Mating season begins in January, with males marking their home range more heavily with saliva and females building leaf nests in tree cavities or burrows. In captivity it has been reported that females can have an average litter size of ten, and up to three litters have been reported in one year. Also, the smallest litter sizes are found near the equator.
The young are born naked and blind and on average weigh about 0.005 oz and measure 10 mm in length. This amazingly small body size means that twenty four newborns can fit into a teaspoon! The newborns must find their way to their mother's marsupium or pouch. They can only move with their forelegs, which are more developed than their hind legs. There are two theories as to how the newborns find their way to the marsupium. The first, and best supported, theory is that newborns find their way to the marsupium by smell. Before birth the mother will lick a path to the opening of the pouch so that the young can follow the trail. The second theory is that the young find their way to the pouch through gravity. Once the newborns have found the marsupium, they attach to the teats, which then swell at the tip preventing the newborns from falling off. The young grow rapidly and are ready to leave the marsupium after about sixty days. (Parker, 1990)
The young are weaned around 100 days. The young reach sexual maturity between 8 and 12 months of age. (Eisenberg, 1989; Eisenberg and Redford, 1992)
Breeding season: The mating season begins in January and ends with the onset of the dry season
Average number of offspring: 10.
Average gestation period: 13-14 days.
Average weaning age: 100 days.
Range age at sexual or reproductive maturity (female): 8 to 12 months.
Range age at sexual or reproductive maturity (male): 8 to 12 months.
Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); fertilization ; viviparous
Average birth mass: 0.2 g.
Average gestation period: 12 days.
Average number of offspring: 6.
The female cares for the young in her marsupium, or pouch, for 60 days. The young are not weaned until they are about 100 days old. (Eisenberg, 1989; Eisenberg and Redford, 1992)
Parental Investment: altricial ; female parental care
Molecular Biology and Genetics
Barcode data: Didelphis marsupialis
Below is a sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.
See the BOLD taxonomy browser for more complete information about this specimen and other sequences.
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Download FASTA File
Statistics of barcoding coverage: Didelphis marsupialis
Public Records: 2
Specimens with Barcodes: 55
Species With Barcodes: 1
IUCN Red List Assessment
Red List Category
Red List Criteria
This species has no special conservation status.
US Federal List: no special status
CITES: no special status
IUCN Red List of Threatened Species: least concern
Relevance to Humans and Ecosystems
Economic Importance for Humans: Negative
Economic Importance for Humans: Positive
No reported positive effects on humans exist.
The common opossum (Didelphis marsupialis), also called the southern or black-eared opossum or gambá, is a mammal species living from the northeast of Mexico to Bolivia (reaching the coast of the South Pacific Ocean to the central coast of Peru), including the Lesser Antilles, where it is called manicou. It prefers the woods, but can also live in fields and cities. The common opossum is sometimes used for food in poorer areas by humans.
Habitat and shelter[edit source | edit]
This opossum is found in tropical and subtropical forest, both primary and secondary, at altitudes up to 2200 m. They use a wide range of nest sites. Most commonly they will create one in the hollow of a tree; however, they will also dig a burrow or nest in any dark location if nothing else is suitable (which often gets them in trouble with humans).
Description[edit source | edit]
Physical Appearance and Weight[edit source | edit]
The common opossum is similar in size to a house cat. The fur of the opossum is actually yellow in the under-fur, but is hidden by the longer black guard-hairs that cover it, while the tail, fingers, and face are lighter "with the tail being without fur, somewhat similar to a giant rat tail." It can measure nearly 20 inches long. It has large ears that are usually black, and its face is usually a pale peach in color, with black whiskers and eyes that reflect reddish in light. With a body length of nearly a foot, and a tail that can reach almost two feet, the common opossum is one of the larger members of its family. They can weigh in at over three pounds.
Behavior[edit source | edit]
Their activity is mainly nocturnal and terrestrial, with some arboreal exploration and nesting. Outside of mating they are usually solitary. They are considered pests due to their somewhat raccoon-like behavior. Raiding trash cans, nesting in locations that are not suitable, and causing mayhem if encountered within a human living space, they are often trapped and killed.
Diet[edit source | edit]
Common opossums have a broad ability to adapt to environmental changes, and their teeth allow them to eat many different types of food, which is obtained mostly on the ground. They can eat small insects, small animals, fruits, vegetables, and also carrion. Their ability to digest almost anything edible gives them a broader range than a human.
Reproduction[edit source | edit]
The female will have 5-9 offspring between one and three times per year after maturity. The mother raises the young by herself.
Lifespan[edit source | edit]
The common opossum lives for around 2.5 years.
Classification[edit source | edit]
They are members the genus Didelphis, which contains the largest American opossums, and the order Didelphimorphia, to which all western hemisphere opossums belong.
References[edit source | edit]
- Gardner, A. L. (2005). "Order Didelphimorphia". In Wilson, D. E.; Reeder, D. M. Mammal Species of the World (3rd ed.). Johns Hopkins University Press. pp. 5–6. ISBN 978-0-8018-8221-0. OCLC 62265494.
- Brito, D., Astua de Moraes, D., Lew, D., Soriano, P., Emmons, L., Cuarón, A. D., Helgen, K., Reid, R. & Vazquez, E. (2008). Didelphis marsupialis. In: IUCN 2008. IUCN Red List of Threatened Species. Retrieved 28 December 2008. Database entry includes justification for why this species is of least concern
- "Checklist of Mammals of Trinidad and Tobago". Republic of Trinidad and Tobago Biodiversity Clearing House. 2005. Retrieved 2010-10-24.