Grey Mouse Lemur

Fascinating facts about the Grey Mouse Lemur

• At 27 grams, the grey mouse lemur is smaller than a golf ball—yet it outsleeps almost every mammal on Earth. During the dry season, it enters torpor for up to 8 months, dropping its body temperature by 6°C and slowing its heart rate to just 20 beats per minute. This isn't hibernation; it's a trick to survive when insects vanish and fruit dries up. By burning almost no energy, a mouse lemur can stretch a single meal's worth of fat reserves across nearly a year.
• A grey mouse lemur's eyes reflect light like a cat's, but for a reason that shocked researchers: they can see in light levels 100 times dimmer than humans can. In Madagascar's midnight forests, they navigate by starlight alone, hunting for insects that only venture out after dark. Their eyes are so enormous for their body size that if a human had the same proportion, our eyes would be the size of grapefruits.
• The grey mouse lemur screams in a frequency so high—up to 80 kilohertz—that human ears can't detect it without a microphone. These ultrasonic calls are used to locate mates across dense forest and to warn others about predators. Scientists only discovered this hidden language in the 1990s, revealing that mouse lemurs live in a sonic world we'd been completely deaf to for centuries.
• Male grey mouse lemurs produce a scent that changes with the seasons, marking their territory with a complexity that rivals any perfume. During breeding season, they spend 4 hours a day marking trees, rocks, and rivals with forehead glands, chest glands, and genital secretions. A single scent mark can broadcast their age, health, and whether they're looking for a mate—all in one invisible chemical signature.
• Madagascar's dry forests where grey mouse lemurs live are being converted to farmland at a rate of 1% per year. Yet because they can survive in degraded habitats and live in captivity, their population has proven stable in ways that larger lemurs haven't. They're living proof that size and adaptability matter more than rarity for survival—the smallest lemur in the world is outlasting many of its larger cousins.

At a glance

About the Grey Mouse Lemur

In the moonlit forests of Madagascar, the grey mouse lemur darts through the underbrush with an air of quiet urgency, its large, round eyes drinking in the faint light as it pursues its nocturnal quest for insects and fruit. With a soft, whispery call, it navigates the dense thicket, its long, thin tail twitching like a metronome as it leaps from branch to branch with an effortless, weightless ease. As it moves, the lemur's tiny paws barely touch the ground, giving the impression that it is floating through the forest, a tiny, ghostly apparition.

Discover more wildlife