A fiddler crab sits in mud in a mangrove swamp at a nature park in Kuala Selangor, 90 km (56 miles) west of Kuala Lumpur, June 10, 2005. Commercial farmers are turning swamps into shrimp farms and threatening a delicate ecosystem that is home to hundred of species, environmentalists say. Picture taken June 10, 2005. TO MATCH FEATURE MALAYSIA-MANGROVES REUTERS/Kamarulzaman Russali BM/mk