Principles of taxonomy -- Formal classification of mammalia -- Review of mammalian classification -- Bibliography -- Index to technical names -- Index to vernacular names siris_sil_16894 ...

The earliest known mammal was a tiny, shrewlike animal that lived alongside the first dinosaurs 225 million years ago, pushing back the appearance of mammals by about 20 million years, a controversial ...

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 ...

At first glance, a hedgehog and a porcupine can look surprisingly similar. Both are covered in sharp-looking spines, both rely on those spines for protection, and both have spent years being confused ...

Paleontologists have identified a previously unknown species of amphicyonid -- the extinct family of carnivorous mammals ...