Singapore, United Kingdom
Male mandrill yawns in its enclosure in the Singapore Zoo.
A male mandrill, Mandrillus sphinx, yawns in its enclosure in the Singapore Zoo, Singapore May 13, 2005. The Singapore Zoo has long been acclaimed for its open zoo concept, where animals live in spacious and landscaped enclosures simulating that of their natural habitat. REUTERS/Tim Chong TC/PN