National Geographic's enterprising photographers have helped readers explore and learn about our beautiful world through their images for more than a century. Here is their best work from the past ...
Another mammal of the darkness that does not leave tracks but is very active is the flying squirrel. Their nocturnal world is in the trees, not usually going to the ground. But this is also the time ...
H5N1 bird flu, a type of avian influenza, has infected dozens of people in the U.S., and spread to seven states and Canada this year. As concern grows over whether it could lead to another ...