It's nice to have a buddy. And in humans, friendships are associated with longer, healthier lives. That, it turns out, is true of dolphins too. At least as far as the males go.A new study suggests long-term dolphin bromances don't just shape behaviour they may actually slow biological ageing.

The research draws on more than forty years of data from Shark Bay in Western Australia looking at a group of Indo-Pacific bottlenose dolphins.