“The Challenge!” Young boy relishes in a game of tug of war before school. Photo location: Lake Titicaca, Peru. (Photo and caption by Paul Heyman/National Geographic Photo Contest)

“Kilauea Rules”. The most extreme place we put ours kayakers to paddle till now. Photo location: Big Island, Hawaii. (Photo and caption by Alexandre Socci/National Geographic Photo Contest)

Ghanaian fans take a selfie prior to a Group G football match between Germany and Ghana at the Castelao Stadium in Fortaleza during the 2014 FIFA World Cup on June 21, 2014. (Photo by Patrik Stollarz/AFP Photo)

India: A sweeper cleans the side of a road near a replica of the Eiffel Tower amid heavy fog in the early morning in the northern Indian city of Chandigarh January 18, 2010. (Photo by Ajay Verma/Reuters)

Photographer Niki Feijen for his new book, “Frozen”, photographed several abandoned buildings across Europe. Capturing their haunting beauty from years of decay. Here: Paperflow – Room inside a former monastery. (Photo by Niki Feijen)

A South American marine animal rescue group “S.O.S Rescate de Fauna Marina” is raising a baby La Plata Dolphin (Pontoporia blainvillei) found beached near Montevideo city with its umbilical cord still attached. The group is headed by Richard Tesore who is shown swimming with the baby female dolphin near the seaside resort of Piriapolis in Uruguay.

As a social experiment, journalist Esther Honig contacted Photoshop artists across the world and told them to make her beautiful, and they did. Honigh said she was surprised by how her image was altered, saying the process has greatly changed her perception of beauty. Photo: “Before & After” project: Greece. (Photo by Esther Honig)

Perched on the snout of a crocodile, this brave frog will probably never realise just how much of a lucky escape it's had. For there's one reason the reptile's beady eye is fixed greedily on its visitor with jaws gaping wide in anticipation - it's feeding time. The crocodile had just devoured the first frog in his enclosure, but appeared unable to capture the second.