The term 'Fork-tailed Bird' refers to four different species of birds: KITE (4 letters), SWALLOW (7 letters), TERN (4 letters), and Drongo (6 letters). Kites are large, long-winged birds of prey that feed mainly on carrion and insects. Swallows are small, agile passerines that feed on insects while flying. Terns are seabirds with long, pointed wings and a forked tail. Finally, Drongos are medium-sized passerines with a forked tail and glossy black plumage. All four species are found in various parts of the world, and they all share the characteristic of having a forked tail.