Here is the Wallpapers Collection form Nat Geo Photo Contest 2013, This beautiful collection is Containing on the Award winning photos of the year 2013. Source: These photos are taken from Nat Geo Website.
Crows Nest, Photo and caption by Yosuke Kashiwakura
The crows that live in Tokyo use clothes hangers to make nests. In such a large city, there are few trees, so the natural materials that crows need to make their nests are scarce. As a result, the crows occasionally take hangers from the people who live in apartments nearby, and carefully assemble them into nests. The completed nests almost look like works of art based on the theme of recycling.
Flying Egrets, Photo and caption by Réka Zsimon
Indian Rhino: Canadian Winter
An Indian rhinoceros, far from home and stuck inside with late-winter blues at the Toronto zoo.
The Ice Bear: Photo and caption by Paul Souders
A polar bear peers up from beneath the melting sea ice on Hudson Bay as the setting midnight sun glows red from the smoke of distant fires during a record-breaking spell of hot weather. The Manitoba population of polar bears, the southernmost in the world, is particularly threatened by a warming climate and reduced sea ice.