A year ago, he was a cute and cuddly ball of white fur who captured the hearts of millions worldwide.
But Knut the polar bear has grown up fast - as this startled young visitor to Berlin Zoo discovered.
Knut now weighs 22 stone and has six-inch claws and a fearsome set of fangs to match.
And he seemed to be particularly keen to test them on the three-year-old boy lying on the ground next to his enclosure.
Fortunately for the youngster, six inches of glass capable of withstanding a mortar attack separated him from the jaws of the world's most famous captive bear.