The Grey-brown Mouse Lemur is endemic to the south and south-east of Madagascar where it is found in spiny forest and dry deciduous forest up to about 250 metres. See the distribution map at IUCN.

The Microcebus lemurs are tiny. This one weighs about 63 grams. They eat gum, insects and fruit. They are often predated by Barn Owls or the Long-eared Madagascar Owl.