Migration refers to directed, regular, or systematic movement of a group of objects, organisms, or people, including: In ecology and anthropology: Gene migration, a process in evolution and population genetics Human migration Bird migration Reverse migration, a phenomenon in bird migration Diel vertical migration, a daily migration undertaken by some ocean organisms Fish migration Insect migration Animal migration Plant migration, see Seed dispersal In science: Cell migration, in biology Molec… (More on Migration)