The greatest butterfly migration on earth
High up in the mountain forests of Mexico, one of nature's greatest spectacles takes place.
Millions upon millions of monarch butterflies blanket the fir trees, huddling together as they wait out the winter. The sheer...
Adorable puffins are remarkably tougher than they look
At first glance, they may not seem particularly tough, but there is more to the adorable Atlantic puffin than meets the eye.