A schoolgirl collects rubbish from Karachi's Clifton beach early morning April 22, 2013, during a cleaning campaign as part of the commemoration of Earth Day. (Photo by Akhtar Soomro/Reuters)
Caleana major, the Flying Duck Orchid is a small orchid found in eastern and southern Australia. This terrestrial plant features a remarkable flower, resembling a duck in flight. The flower is an attractant to insects, such as male sawflies which pollinate the flower in a process known as pseudocopulation. In 1986 this orchid was featured on an Australian postage stamp.
Maria, 18, wearing a traditional Sevillana outfit, poses for a portrait during the traditional Feria de Abril (April fair) in the Andalusian capital of Seville April 16, 2013. (Photo by Marcelo del Pozo/Reuters)
French artist Thomas Lamadieu, also know as Roots Art, must really love looking at the sky. Every time he looks up, Thomas sees a potential canvas where the building rooftops frame the sky. He photographs it and uses the odd sky shapes to create whimsical line drawings. “My artistic aim is to show a different perception of urban architecture and the everyday environment around us, what we can construct with a boundless imagination,” says Thomas. (Photo by Thomas Lamadieu)
The Inca Tern is a seabird in the family Sternidae. It is the only member of the genus Larosterna. This uniquely plumaged bird breeds on the coasts of Peru and Chile, and is restricted to the Humboldt current. It can be identified by its dark grey body, white moustache on the both sides of its head, and red-orange beak and feet.
Villagers cry for their relatives who were killed in an earthquake during a funeral in Longmen village, in Lushan county in southwest China's Sichuan province, on April 21, 2013. Rescuers and relief teams struggled to rush supplies into the rural hills of the area after an earthquake left at least 180 people dead and more than 11,000 injured. (Photo by Associated Press)
Gunfire erupted at a Denver pot celebration Saturday, injuring two people and scattering a crowd of thousands who had gathered for the first 4/20 counterculture holiday since the state legalized marijuana... Photo: A woman smokes a large marijuana joint at the Vancouver Art Gallery during the annual 4/20 day, which promotes the use of marijuana, in Vancouver, British Columbia April 20, 2013. (Photo by Ben Nelms/Reuters)