A viper with ruby-red eyes, a frog that sings like a bird and a catfish that can walk on land - these are a few of the 126 new species of flora and fauna discovered last year in the Greater Mekong region, the World Wildlife Fund, or WWF, said Tuesday.

Other discoveries are a demonic-looking bat, a blind fish that lives 7 kilometers (4 miles) underground and a tiny fish whose golden body illuminates the river depths, according to a note released by the conservationist organization.

Unlike the males of other frog species that croak to attract females, Gracixalus quanqi, which lives in the northern Vietnamese jungles, sings like a bird during mating season.

WWF scientists also discovered in southern Vietnam and eastern Cambodia the pit viper (Trimeresurus rubeus), whose rich green scales contrast with its ruby-colored eyes, among the 21 reptile species discovered, according to WWF in its document entitled "Extra Terrestrial."

The Greater Mekong region includes the Mekong River that flows through the entire Southeast Asian peninsula on its course through Myanmar, Cambodia, China, Laos, Thailand and Vietnam, where several endangered species live including the Asian elephant, the Mekong giant catfish and the Irrawaddy dolphin. EFE