A Penguin's Waddle Is More Efficient Than Your Walk (Who's Laughing Now?)

Penguins swim with speed and grace, but on land, they're an adorable mess, heaving their portly bodies to and fro to shuffle one stubby little leg in front of the other. Well, don't be so quick to judge; that cartoonish walk is actually among the most efficient in the animal kingdom. It's even more efficient than yours.