Heterochromia iridum is a difference in coloration of the iris and is a result of the relative excess or lack of melanin.
In this photo by Arturo De Frias, we see a Cheetah (Acinonyx juvatus) silhouetted against a fiery sunset in the Oakavango Delta, Botswana.
Sean Kenny is an artist and LEGO Certified Professional; a self-proclaimed ‘Professional Kid’ that makes a living creating things with LEGO.
Arturo de Frias Marques photographs a giant oceanic manta ray (Manta birostris) filter feeding off the coast of West Papua, Indonesia.
Two Julia Butterflies (Dryas iulia) are seen drinking the tears of turtles in Ecuador. The phenomenon is known as lachryphagy.
The team had 40 stacked, 20,000-lumen projectors display animals 375 ft tall by 186 ft wide; covering 33 floors of the building’s southern face.
Selected from more than 17,000 entries, an underwater photo of divers near humpback whales has won the 2015 Nat Geo Traveler Photo Contest.