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.
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 .
A group of shelter dogs showcase their loveable personalities in a series of passport-style photographs - in the hope of finding their forever homes .
POWERFUL bolts of lightning illuminate the night sky in an incredible autumn storm over the Sardinian coastline .
With one hand rested on his belly and the other propping his head up, this lazy lizard takes an afternoon break .
A proud gorilla mum welcomes her newborn baby western lowland gorilla, a critically endangered species .
A lively lemon shark grins into the camera and showcases his impressive teeth .
Leaping out of the ocean, a group of gentoo penguins fly through the air before landing safely on an iceberg .
Staring death in the face, a little field mouse bravely confronts a hungry cat .
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 .
EXPERTLY camouflaged, this clever panther chameleon knows how to catch its prey by surprise .
THIS incredible shimmer of silver fish mirrors the image of that of an underwater tornado .
SITTING on a burning sofa unable to move, one man turns his terrifying dreams into reality .