genus Marmosa is divided into five species groups with
a wide range of sizes and coloration. Head and body lengths
range from 85-185 mm, with tail lengths from 90-280 mm. Nearly
all forms of the genus have brown or black markings around the
eyes. The ears can be lowered by crinkling them down, similar
to the furling of a sail. Most species have short velvety fur.
M. murina has no pouch, but the tail is strongly prehensile.
The number of mammae varies from 9-19, depending on the species,
and some have pectoral as well as abdominal mammae.
Most species of Marmosa are forest dwellers, preferring
streams or moist habitat. They are generally arboreal and nocturnal.
Nests are built of leaves and twigs, though abandoned bird's
nests are sometimes used. Marmosa are primarily solitary,
hunting and nesting alone.
diet consists of insects and fruits, but may also contain rodents,
lizards and bird eggs.
Litter size is 7-9 offspring with the babies being weaned at
60-70 days. Females reach reproductive maturity at 1 year, and
the ability to reproduce declines beyond this age.
M. murina is found in Columbia, Venezuela, Trinidad
and Tobago, Guyana, Surinam, French Guiana, Brazil, E Ecuador,
E Peru and Bolivia.