A joint research team has discovered a fossil belonging to a previously unknown genus and species of mammal in the Late Cretaceous (100–66 million-year-old) strata of Mongolia's Gobi Desert. The mouse ...

While their scaly armor and long claws look vaguely reptilian, armadillos belong to the same group of mammals as sloths and anteaters. There are nearly two dozen species of armadillos, from six-inch ...

Small mammals are early warning systems for environmental damage, but many species look almost identical, making them hard to track. Scientists have developed a new footprint-based method that can ...

A resplendent rainbow fish, a frog that looks like chocolate, a Thai tarantula, an anemone that rides on a back of a hermit crab, and the world’s largest waterlily are among the new species named by ...

Mammals are not especially diverse. Roughly 6,800 mammal species are known to exist, compared with about 8,800 species of amphibian, 11,000 species of bird and 12,500 of reptile. Yet when most people ...