A narwhal tusk that is nearly seven feet long is extremely rare. Here's where you can see it in Massachusetts.

Each species has specific rituals to attract mates, and success typically comes from doing what is expected (and doing it ...

The biggest stories of the day delivered to your inbox.

Stunning discoveries and fresh breakthroughs in DNA analysis are changing our understanding of our own evolution and offering a new picture of the "other humans" that our ancestors met across ...