The female reproductive system includes internal and external organs, each designed to carry out varying functions. Learn more about the anatomy of this system.

A single gene in the shorebird species known as ruffs controls the levels of testosterone in males, and this in turn affects ...

A New Hampshire man has become the second person known to be living with a pig kidney. Massachusetts General Hospital ...

As it turns out, the tiny hummingbird is quite a busy bird. Hummingbirds are almost always hovering. They even stay flying ...