Spring-Loaded Dinosaurs: What Penguins, Kiwis, and Armored Core Get Right (and Wrong) About Legs

Look at a penguin skeleton side-on and you'd be forgiven for thinking you're looking at a small theropod dinosaur. Upright posture, forward-leaning stance, stubby vestigial forelimbs, powerful hind legs. The kiwi is arguably even more convincing — its wings are so reduced they're invisible, leavi...