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 ...

Cold water rushes over gravel and stones as the river winds through forests and wetlands before joining the vast waters of ...

Explore 25 prehistoric animals that are alive today! From deep-sea coelacanths to ancient horseshoe crabs, discover ...

Creatures that bridged the gap between reptiles and mammals may have been bearing live young 90 million years earlier than we thought. One of the hallmarks of all mammals apart from monotremes – ...

Microbial symbionts influence host fitness and developmental trajectories throughout the life cycle, but two factors are ...

Cold water rushes over gravel and stones as the river winds through forests and wetlands before joining the vast waters of ...

Explore 25 weird sharks you never heard of! From walking sharks to living fossils and deep-sea mysteries, uncover the ocean's ...

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.

Fertilization is often imagined as a frantic race, with millions of sperm competing for a single prize. But new research by a team of evolutionary biologists from Syracuse University, the University ...

Why do women, on average, live longer than men yet often face a greater burden of chronic disease later in life? Why do some ...