Avian orientation and navigation.
D000818:Animals; D001307:Auditory Perception / Q000502:physiology; D001717:Birds / Q000502:physiology*; D006112:Gravitation; D008280:Magnetics; D009949:Orientation / Q000502:physiology*; D012903:Smell / Q000502:physiology; D013472:Sunlight; D014785:Vision, Ocular / Q000502:physiology; D014887:Weather