(CNN) — A tiny creature with frilly gills, a polite smile and glowing green skin just gave scientists a major clue to solve one of biology’s biggest mysteries: limb regeneration. Aquatic salamanders ...

With their goofy grins and feathery gills, axolotls have become stars of the pet world and video games like Minecraft. But these small, smiling salamanders are also helping scientists explore a ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. A tiny creature ...

Researchers are studying axolotls -- "small, smiling salamanders" -- in the hopes of learning how humans might one day regrow arms or legs. Photo by Adobe Stock/HealthDay News With their goofy grins ...