Add Yahoo as a preferred source to see more of our stories on Google. Next week, Anderson Cooper heads to the mountains of Mexico to witness one of nature's great migrations: monarch butterflies.

With the help of citizen scientists, researchers studying rare humpback ‘jaw-gaping’ believe the move could be a social display Follow our Australia news live blog for latest updates Get our breaking ...

The great migrations of the world are dwindling. The mule deer is stumbling upon new oil wells along its ancient route, and watching helplessly as the greenery it once chased retreats ahead of it, and ...