Mammals only have one life to live, but the length of that life varies greatly. While some shrews shuffle off this mortal coil in less than 14 months, bowhead whales can swim in Arctic waters for more ...

According to most experts, the first mammal was Morganucodon, a small, shrew-like rodent that appeared during the Jurassic Period, approximately 200 million years ago. It weighed a few ounces and ...

Male and female Eurasian bullfinch (Pyrrhula pyrrhula). The inheritance mechanism in birds is the opposite of the mammal one. It’s the female who is ‘heterogametic’ — she has both a W and a Z ...

Sexual behavior is one reason why female mammals typically live longer than their male counterparts, according to a new study. Researchers from Germany, Denmark, France, Hungary and Belgium analyzed ...

New research has dramatically expanded the known roster of mammals on Earth. A new review published in the Journal of Mammalogy shows that the number of living mammal species has surged to nearly ...

There are roughly 2.5 million known species on the planet, but scientists estimate that's only a fraction of the biodiversity on Earth. A new study shows we're finding new species like never before.

Scientists found an unexpected aging pattern in a mostly intact juvenile mammal skeleton from the paleontological period. By Jack Tamisiea Small mammals often live fast and die young. Rodents and ...