Vets prepare to conduct an X-ray for Bena, a 11-year old male Proboscis monkey, after it was sedated for a routine health inspection at the Singapore Zoo in Singapore July 5, 2011. Three Proboscis monkeys are undergoing checkups ahead of being sent to Apenheul Primate Park in the Netherlands as part of an animal exchange to kick start a captive breeding programme. The zoo in Singapore is the first wildlife reserve to successfully breed Proboscis monkeys in a captive environment, according to an official. REUTERS/Joel Boh (SINGAPORE - Tags: ANIMALS SOCIETY)