Cercartetus caudatus
long-tailed pygmy possum

Widespread in New Guinea. Also found in the vicinity of Cairns, northeastern Queensland, Australia. (Collins 1973)

Cercartetus caudatus live in temperate rainforests, at altitudes of more than 300 meters. (Strahan 1983)

The tail of Cercartetus caudatus is approximately 135 mm in length, and the head and body together are approximately 106 mm . The tail length varies between 128 and 151 mm; the tail can be nearly one and a half times the length of its head and body. Other characteristics include large eyes, mouse-like ears, a pouch that opens anteriorly (as in didelphids), a well-developed and opposable hallux that does not have a claw, expanded pads at the ends of the digits, quadritubercular molars, a broad, flattened skull, and three upper incisors and one lower incisor that are enlarged and procumbent. (Lawlor 1979, Ride 1970, Strahan 1983, Vaughan 1986)

Very few specimans of C. caudatus have been observed in the wild, but several nests have been studied. The nest is more or less spherical in shape and is constructed from leaves or fern fronds. Lactating females share a nest with their offspring, but not with other adults. Several males have been found sharing a nest, as well as non-lactating females. Some nests contain four to five animals, while others contain only one. With respect to feeding habits, this species is generally found foraging for food alone, but groups of up to four have been seen as well.

It is also known that this species is arboreal and nocturnal. In cold weather, C. caudatus have been observed to become torpid, appearing stiff and cold to the touch with the lips pulled back over the teeth, resembling death. This condition has not been observed to last overnight and the adaptive significance is not known. (Strahan 1983)

Cercartetus caudatus have been found to eat nectar and insects in captivity, and may consume pollen instead of insects to meet protein needs in the wild. The dental morphology of C. cauatus (quadritubercular molars) is consistent with the insectivorous component of their diet. The lower central incisors of C. caudatus are similar in dimension to those of Gymnobellideus, which uses its lower incisors for wood gouging, suggesting that C. caudatus also uses its lower central incisors to gouge wood, looking for insects. Although not much is known about this animal, the tooth morphology, as well as an examination of several specimans' stomach contents, has shown that the Long-tailed pygmy possum is predominantly insectivorous. (Smith 1986)

This species is listed under a lower risk (near threatened) category. The biggest threat to the Long-tailed pygmy possum is the destruction of rainforests, which is its natural habitat. Also, because this species is not widespread throughout Australia, any rainforest destruction in its range may have a large impact on the abundance of this animal. The Long-tailed pygmy possum is widespread in New Guinea and does not seem to be in special danger there. (Maxwell, et al. 1996)

The tail of C. caudatus becomes enlarged with fat as winter approaches, functioning as a fat-storage organ. (Ride 1970, Vaughan 1986)