A fisherman casts a net on the Mekong River, home to Irrawaddy dolphins, also known as the Mekong dolphins, at Kampi village in Kratie province, 230 km (143 miles) northeast of Cambodia, March 24, 2007 .Cambodia's rare Mekong dolphin is making a tentative comeback from the edge of extinction after net fishing was banned in its main habitat, Cambodian and World Wildlife Fund officials said earlier this month. REUTERS/Chor Sokunthea (CAMBODIA) Also see image: GF2DWUDTUNAA