title: Birds return every spring like clockwork, but where is the clock?
authors.affiliation: Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, Maryland 21230, USA. gball@jhu.edu
authors.forename: Gregory F
authors.initials: GF
authors.lastname: Ball
authors.forename: Jacques
authors.initials: J
authors.lastname: Balthazart
mesh_terms: D025041:Animal Migration / Q000502:physiology*; D000818:Animals; D001683:Biological Clocks / Q000502:physiology*; D001717:Birds / Q000502:physiology*; D001921:Brain / Q000502:physiology*