National Geographic celebrates Earth Month with some flightless, feathered friends in "Secrets of the Penguins," streaming ...

This story appears in the August 2010 issue of National Geographic magazine ... thanks largely to their geology and water chemistry. In these flooded caves, such as Stargate on Andros Island ...

This story is part of a special National Geographic News series on global water issues. Rivers are the lifeblood of many plant, animal, and human communities. Yet many of the world's rivers have ...

This story appears in the May 2015 issue of National ... “Now the water goes up and down drastically, and we don’t know when it’s going to change—unless we watch the storms.” ...