The penguins crowded around a green wheelbarrow, eager to see what was making the clattering noise inside. Moments later, more than 1,000 colorful pebbles dropped onto their habitat’s pavement. Each ...

Penguins may not be relationship experts, but some of their habits are surprisingly healthier than the way many humans treat ...

At the Edinburgh Zoo, gentoo penguins charm potential mates with carefully chosen pebbles painted by kids at a children’s hospital.

Gentoo penguins at Edinburgh Zoo court mates by choosing pebbles hand-painted by children at a local hospital.

It seems like it would be hard for penguins to tell each other apart when they're nesting in huge colonies since they all have the same black-and-white plumage. But at least one species of the birds ...