These charismatic primates are incredibly diverse — and disappearing. The brown mouse lemur (Microcebus rufus) is among the shortest-lived of all primates, with a lifespan of only about six to eight ...

This brown mouse lemur is not thrilled about being in the spotlight. When an animal won't stay still long enough for to snap a photo, adding it to the Photo Ark can be a painful process. Watch Joel ...

When mice are given a more engaging place to live with greater opportunities for social stimulation, some of their energy-storing white fat is transformed to energy-burning brown fat. As a result, the ...

SONOMA — In a lightning flash of brown, a tiny mouse with big black eyes and a long, thick tail leapt from a pickleweed plant and disappeared in the early-morning light of the marsh. The movement was ...