Britain’s Prince George chews on a commemorative card given to him by his mother Catherine, Duchess of Cambridge, as he is held by his father Prince William at Bilby Enclosure in Taronga Zoo in Sydney

Britain’s Prince George chews on a commemorative card given to him by his mother Catherine, Duchess of Cambridge, as he is held by his father Prince William at the Bilby Enclosure in Taronga Zoo in Sydney April 20, 2014. Prince William and his wife Kate are undertaking a 19-day official visit to New Zealand and Australia with their son George. REUTERS/Chris Jackson/Pool (AUSTRALIA – Tags: ROYALS ENTERTAINMENT)