Why did our ancestors ditch the shell and start growing babies inside their bodies instead? In this episode of Big Ideas, ...

Many mammals have fur the color of brown and black. Why don't they have more exotic colors, like purple and neon pink?

Baby dinosaurs weren’t coddled like lion cubs or elephant calves—they were more like prehistoric latchkey kids. New research suggests that young dinosaurs quickly struck out on their own, forming ...

Animal communication is more than simple signals. Mammals use sounds, expressions, and touch to convey emotions and social messages. Brain cells called mirror neurons help them understand feelings.