Gizmo the veiled chameleon seemed unfazed but her admirers. Her owner said she was definitely posing for my camera. "Is it a boy or girl?" I asked, and "how can you tell?" Very easily. Girls are green. Boys are brightly coloured, the helmet on their head is much bigger and they are born with a heel. Native to Yemen and Saudi Arabia, Gizmo seemed very comfortable being surrounded with her London admirers.