Whales 'support grannie hypothesis'
https://uk.news.yahoo.com,
Scientists studied the whales as they hunted for salmon in the North Pacific Ocean, off the coasts of the US and Canada.
Scientists studied the whales as they hunted for salmon in the North Pacific Ocean, off the coasts of the US and Canada.
Female killer whales live for years after menopause to lead their families to food and save them from starving in tough times