A pair of adorable polar bear cubs play-fight with each other in the Alaskan snow. Pictured on the coast of Kaktovik on Barter Island, the young polar bears roll around in the powdery snow as they tickle and wrestle together. Finishing their play-date, one of the cheeky bears teasingly sticks out its tongue before bounding towards their mother.
At least three people have been killed and more than 100 injured, some seriously, in two explosions at the finish line of the Boston Marathon .
This starling and prairie dog will not back down an inch as they have a fearsome stand-off over who gets to eat a nut .
TOWERING 65 metres into the sky, this terrifying accent is a dream for climbers .
Swirling water and sand create amazing aerial images of river deltas across Iceland .
IN THE not so MISTY MOUNTAINS of Wiltshire, there lies an abandoned hobbit house .
The aurora lights captured in Blair Nebraska, America - WITH electrifying purple and illuminous green brightening up the night sky, this is the rare moment a flash of 'sprite' lightening was captured on camera .
These beautiful photographs show how these playful pods of dolphins make their own fun by gliding, flipping and spinning through the air whilst enjoying the sun on their backs .
COURAGEOUS CLIMBERS scale frozen waterfalls in Canada, as the ice threatens to collapse beneath them .
MESMERIZING night sky photographs offer a spellbinding look at the stars .
The lighthouses of Brittany, from Brest to Le Conquet, stand tall on France’s north-western coast against stunning scenery .
SPURTING water 20ft into the air, this is one well you wouldn't want to dip your bucket into .
A Romanian photographer has captured the unique patterns of hundreds of human eyes in a series of striking macro shots .