A variety of animals species, including crows, monkeys and dogs, can match voices to familiar faces. But lemurs go one sense further: smell. When these raccoon-sized primates recognize a female lemur's call, they can follow their noses to where that lemur last left her scent.
Lemurs rely on both sounds and smells to identify each other as they scrounge for food in the dense Madagascar rainforest. Using a gland near their genitals, the primates unleash scent signatures made up of hundreds of odor molecules.