Caluromys derbianus can be found in both highland and lowland rain forests in the region between south-central Veracruz, western Columbia, and northern Ecuador. Bucher and Hoffmann (1980)

Biogeographic Regions: neotropical (Native )

Caluromys derbianus is the largest species in the genus. It is a long, slender animal weighing from 200 to 400 grams. The common name of this opossum is derived from its woolly pelage. A dark strip is often present running from the crown to the fleshy portion of the nose. Pelage color shows much geographic variation. Its ears are creamy white to pink. All digits of the front and hind feet are clawed with the exception of the opposable hallux. The tail constitutes up to two-thirds of its total length. The latter half of the tail is naked and prehensile. Barrington and Willis (1973) ; Bucher and Hoffmann (1980)

Average mass: 330 g.

Average basal metabolic rate: 1.194 W.

• Terrestrial

The woolly opossum inhabits both lowland and highland rainforests to a maximum altitude of 2,460 meters. Bucher and Hoffman (1980)

Terrestrial Biomes: rainforest

Although food habits have not been investigated thoroughly, this opossum also appears to be omnivorous. Captive animals have eaten fruit, insects, and mice. They have been maintained on a laboratory diet of raw egg, fruit, and dog food. Bucher and Hoffman (1980)

Average lifespan

Status: captivity: 8.7 years.

Litter size for C. derbianus is usually three or four, although it may be as high as six. The woolly opossums breed during the dry season (January to June) in Central America, however a few studies indicated that breeding may extend into the first few months of the rainy season (July to September). In Nicaragua it has been suggested that they breed throughout the year. The estrous cycle has an average length of 27 to 29 days and is maintained year round. The young attach to a teat after birth (in a pouch), where they are nurtured until they reach a level of development similar to young placentals at birth. Caluromys derbianus reaches sexual maturity at seven to nine months and has been reported to live in excess of five years in captivity. Bucher and Hoffman (1980) ; Dawson (1983)

Average number of offspring: 3.

Average age at sexual or reproductive maturity (male)

Sex: male: 240 days.

Average age at sexual or reproductive maturity (female)

Sex: female: 240 days.

The woolly opossum has no special conservation status. (Bucher-Hoffman, 1980.)

IUCN Red List of Threatened Species: least concern

Once hunted for its fur, and possible important as a disperser of tropical trees. Bucher and Hoffman (1980)