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The Gray Mouse Lemur (Microcebus murinus) is a small lemur, a type of strepsirrhine primate, found only on the island of Madagascar. Weighing 58 to 67 g, it is the largest of the mouse lemurs (genus Microcebus), a group which include the smallest primates in the world. The species is named for its mouse-like size and coloration and is known locally (in Malagasy) as Tsidy, Koitsiky, Titilivaha, Pondiky, and Vakiandry. Nearly indistinguishable from each other by appearance, the Gray Mouse Lemur and all other mouse lemurs are considered cryptic species. For this reason, the Gray Mouse Lemur was considered the only mouse lemur species for decades until more recent studies began to distinguish between the species.

Like all mouse lemurs, this species is nocturnal and arboreal. It is very active, and although it forages alone, groups of males and females will form sleeping groups and share tree holes during the day. It exhibits a form of dormancy called torpor during the cool, dry winter months, and in some cases undergoes seasonal torpor (or hibernation), which is unusual for primates. The Gray Mouse Lemur can be found in several types of forest throughout western and southern Madagascar. (Read more...)