A sweet-singing frog (Gracixalus Quangi), which uses unique calls to attract females, was one of the new species discovered in the high-altitude forests of northern Vietnam in 2011. A new report from the WWF details other discoveries made last year -- 126 new species in the Greater Mekong area, from a devilish-looking bat to a walking catfish. (AFP/WWF/Jodi J.L. Rowley/Australian Museum)
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