Using tiny "backpacks," a scientist tracks North American songbirds to their tropical wintering grounds for the first time and finds they travel faster than previously known. With video.
Migratory birds are among the world's most accomplished air travelers, but scientists are still trying to solve the mysteries of how they do it and where many species wind up.
Forty-seven million years ago primitive whales gave birth on land, according to a new study of a pregnant whale fossil that sheds light on how these mysterious mammals moved from land to sea.
Two hundred years after Charles Darwin's birth, scientists around the world are exploring the varied ways existing species adapt and new species arise.
Long legs and skittish behavior are recently evolved traits that allow fence lizards in the southeastern U.S. to co-exist with lethal and invasive fire ants, providing hope for species facing abrupt climatic changes.
Archaeologists at a remote lake in Chiapas search for clues to what life was like for the unconquered Maya 500 years ago and how it has, or hasn't, changed for their descendants.