The term 'long-plumed bird' can be used to describe two different species of birds, the IBIS and the EGRET. The IBIS is a wading bird with a long curved bill and a glossy black head. It has a wingspan of up to 1.5 meters and is found in wetlands and grasslands around the world. The EGRET is a white heron with a long neck and long plumes on its back and wings. It has a wingspan of up to 1.8 meters and is found in wetlands, marshes, and other wetland habitats. Both species are important indicators of wetland health and are protected by international laws.