The winners of the 51st annual Nikon Small World photo contest offer a glimpse at some of the tiniest—and most beautiful—parts of the natural world.

Excess nutrients, warmer temperatures, and an increasing population are causing explosions of algae worldwide.

In an unprecedented effort, 15 aquariums from around the world are teaming up to raise endangered baby zebra sharks and reintroduce them into the wild, where populations have nearly gone extinct.

National Geographic’s top wildlife photos arrive at the Momentary Nov. 22, showcasing nature’s beauty and photography’s ...

If it seems like the weather has been all kinds of crazy in your corner of the world in recent years, you probably aren't just imagining things. So says the September 2012 edition of National ...