Every dinosaur came from an egg, but exactly how those eggs cracked open is something we know little about. That's why a ...

A pinch of methylmercury is just ducky for mallard reproduction, according to a new federal study. The findings are counterintuitive, since methylmercury is ordinarily a potent neurotoxic pollutant.

That’s a frog embryo, leaving its egg to enter the world, and this embryo can hatch at will. The red-eyed tree frog lays its eggs on a branch or leaf above the water. Once they’re in the last third of ...

For millions of years of existence, dinosaurs' extinction was not as a result of their size, strength, or ferocity, but ...