A new study shows that polar bears require more food than previously thought. The scientists used collars that tracked bears' movements and metabolic rates.
The US Department of Agriculture kills thousands of predators yearly, mainly for attacking livestock. A conservation biologist explains why this policy is ineffective and ecologically harmful.
March Mammal Madness, a tournament of imaginary contests between pairs of mammals, makes science irreverent and fun. The event has thousands of fans and is used in hundreds of classrooms.
It's all about mating success.