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 ...

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: ...