The mongoose lemur (Eulemur mongoz) inhabits dry deciduous and moist forests in northwestern Madagascar and on the Comoro Islands where it has been introduced by humans. It has a body length of about 35 cm and weighs 2–3 kg, with a relatively long tail. Males and females differ in facial coloration, and they form small family groups in which females are dominant. Activity patterns vary with the season, reproduction is seasonal with young born in August–October, and its conservation status is Critically Endangered (IUCN Category I A).