This is the terrifying moment a polar bear headbutts the glass in a zoo as he attempts to make a lunge for a little girl’s penguin toy. <br /> <br />Excited to see her favourite animal, Emma Garrett, aged four, runs and jumps around in excitement in front of the polar bear enclosure at Saint Louis Zoo in Missouri, USA. <br /> <br />After making a friend in the resident polar bear, Kali, Emma shows off her newest cuddly companion to him, a multi-coloured penguin she picked up from the zoo gift shop. <br /> <br />As she holds the penguin out with pride, the polar bear slides its paws and face down the glass to get a better look at Emma and her new prized possession
