Researchers mapped ear canal shape to body temperature to predict when ancestors of mammals first became endothermic.

An analysis of skull and vertebrae fossils suggests that an early relative of giraffes butted heads to compete for mates, which may reveal why modern giraffes are so throaty.

Researchers tracked the movements of endangered caribou and sequenced a portion of their genomes to determine which genes may influence migratory behavior.

More than two-thirds of mammals in Africa and the Arabian Peninsula went extinct during the Eocene-Oligocene transition some 30 million years ago, a study finds.

The discovery of two new species within the Cynomops genus has expanded the total known number of dog-faced bat species to eight. 

Parallel evolution in jaws and teeth helped early mammals diversify their diets.