Sartore is a National Geographic Explorer, wildlife photographer, and conservationist. In 2006, Sartore founded the Photo Ark project to show the world the beauty of biodiversity and inspire ...

To honor Koko's memory, National Geographic is republishing "Conversations With a Gorilla," our October 1978 cover story written by Francine Patterson, the psychologist who taught Koko how to sign.

But it might be something different.” The nonprofit National Geographic Society, committed to illuminating and protecting the wonder of our world, funded Explorer Aaron Micallef's work.

As spring begins, so does a fresh song at daybreak, unique to the season. Just before the sun rises, birds start singing their melodies, creating a chirpy symphony. “It's the epitome of spring ...