Add Yahoo as a preferred source to see more of our stories on Google. Guest Opinion. Altruism is helping without a benefit and sometimes at a risk to one’s self. Animals helping others of their own ...

Humans have climbed to the top of the food chain by skillfully hunting, trapping, and fishing for other animals at scales that far exceed other predators, altering how the animals behave and earning ...

SALT LAKE CITY — Each spring, a grizzly bear emerges from its den after months of deep hibernation — having eaten nothing, barely moved and slowed its heart and metabolism to a crawl. Yet it wakes up ...