When saltwater fish long ago evolved to live in fresh water, many of them also evolved a more sophisticated hearing system, ...

A 430-million-year-old fossil has rewritten leech history, showing they are at least 200 million years older than previously believed. Unlike today’s bloodsucking leeches, their ancient ancestors ...

This message is still resonating, but not quite as clearly as it once did. While nearly seven out of ten Americans want more ...

Some animals, called extremophiles, can survive even the harshest conditions possible, like the inside of a volcano or even outer space.

Jane Goodall, the conservationist renowned for her groundbreaking chimpanzee field research and globe-spanning environmental ...