Why Do Frilled-Neck Lizards Frill? Frilled-neck lizards frill their necks for a few different reasons, primarily for defense and communication. Frilled lizards use their frills to communicate with ...

Lizards that run on two legs haven't evolved to pull the stunt; they're simply pulling a wheelie. Researchers have found that lizards shift their center of mass back as they accelerate forward so that ...

Many groups of animals, from humans to dinosaurs to kangaroos, have evolved the ability to stand and walk on two legs. In all of these cases, the move from four legs to two has provided clear ...

Why bother running on hind legs when the four you've been given work perfectly well? This is the question that puzzles Christofer Clemente. For birds and primates, there's a perfectly good answer: ...