Indri

Weight:
The indri weighs 7 - 10 kg (15 - 22 lb). 

Habitat:
The indri is found in montane moist forest up to 1500 m (4900'). 

The indri occurs in the Madagascar Moist Forests Global 200 Ecoregion. (Olson & Dinerstein 1998, Olson & Dinerstein 1999) 

Age to Maturity:
7 - 9 years. 

Gestation Period:
120 - 150 days. 

Birth Season:
May. 

Birth Rate:
A single young is born. There are 2 - 3 years between births. 

Early Development:
A baby indri rides on its mother for up to 8 months, by which time it is moving on its own. However, it stays with its mother for close to 2 years. 

Diet:
The indri's diet consists of leaves, flowers and fruit. It also occasionally eats dirt. 

Behavior:
The indri is diurnal and arboreal, descending to the ground only to eat dirt or to cross small treeless areas. It is active for 5 - 11 daylight hours. It is generally found in trees at heights of 2 - 40 m (7 - 130'), sleeping 10 - 30 m (30 - 100') above the ground. 

Social Organization:
The indri lives in small groups of from 2 - 5 individuals, usually consisting of an adult pair and their young. The female apparently is the dominant member of the pair.

Spacing between groups of indri may be conditioned by the famous loud morning calls (which are answered from as far as 3 km (2 mi) away), accounting for a relatively small degree of range overlap between neighboring groups (Mittermeier et al. 1994). 

Density/Range:
Density: 

Densities in one study ranged from 9 - 16 individuals/sq km (23 - 42 individuals/sq mi), in both primary as well as degraded forests. 
Range: 

Home ranges of indri groups in one study averaged about 18 hectares (45 acres). A core area within the home range constitutes a territory which is defended against other groups. 
(Mittermeier et al. 1994) 

Minimum Viable Population:
Minimum viable population density: 3 individuals/sq km (7.8 individuals/sq mi) (Silva & Downing 1994).