Altruism is helping without a benefit and sometimes at a risk to one’s self. Recent research that found killer sharks ...

Puzzled by the behavior, Darwin described altruism in animals as a type of evolutionary snag. In 1964, another naturalist proposed an explanation — animals were more likely to share with others who ...

When Towers asked his colleagues, he discovered that they, too, had been gifted food by killer whales. All in all, just from ...

The findings suggest that the instinct to help others in distress could be deeply rooted in mammalian evolution, challenging long-standing ideas about altruism in the animal kingdom.