A file picture shows a 'Brookesia micra' chameleon on the fingernail of a researchers hand in Madagascar, March 16, 2007. The so-called 'Brookesia micra' chameleon, believed to be the world smallest, has been discovered on the island of Madagascar, German and American biologists announced on Feb 16, 2012. The lizard, with a 16-millimetre body, measures 29 millimetres with its tail full extended. Picture taken March 16, 2007. [Photo/Agencies]