Scientists studying one of nature's greatest reproductive innovations have discovered how some lizards evolved from laying eggs to giving birth to live young. The new research is the first to reveal ...

Chinese scientists studying a 244-million-year-old ichthyosaur Mixosaurus fossil from Southwest China’s Guizhou Province ...

A model of Microraptor being put on display at the American Museum of Natural History. Microraptor was one of the smallest known dinosaurs, weighing about one pound—roughly the size of a large rabbit.

Almost all mammals give birth rather than laying eggs, and we have new clues about when they began to do so ...

A bird egg can look surprisingly oversized for the body that produced it. That puzzle becomes even stranger when viewed ...

How can a fish be born as one sex and later become another? For most animals, the answer is simple. They are born either male ...

For decades, the public image of dinosaurs has been dominated by giants weighing several tons. The formidable Tyrannosaurus ...

It’s a tyke-rannosaur. The T-rex might have grown into the biggest, most terrifying creature to ever roam the planet, but it started life no bigger than a house cat. British researchers claim they’ve ...

Add Yahoo as a preferred source to see more of our stories on Google. A complete Cretaceous shellfish fossil. (University of Portsmouth) Nature has imbued its mothers with many surprisingly strange ...

Detailed reproductive histories are an important part of a woman’s overall CVD risk factor assessment and may help pinpoint those who could benefit from early prevention strategies, new data suggest.

A spiny, orange sea creature that lives on the seafloor and can survive for 200 years doesn’t seem like an obvious window into human reproductive biology. But a new study has found that the ovaries of ...