Mammal carnivore is major discovery
US scientists describe a new animal living in the cloud forests of Colombia and Ecuador - the first new mammal carnivore species to be identified in the Western hemisphere in 35 years.
Deep-diving mammals' secret revealed
Study solves the mystery of one of the most extreme adaptations in the animal kingdom: how marine mammals store enough oxygen to hold their breath for up to an hour.
Earliest mammal ancestor pinpointed
Researchers using a vast database of physical and genetic data determine the ancestor of all placental mammals was small, furry and probably ate insects.
Dinosaurs' cold blood in doubt
Growth-related markings on the bones of modern warm-blooded animals similar to those on dinosaur bones challenge the idea dinosaurs were cold-blooded.