Photoreception and chemoreception: questions for the evolution and development of orientation.
D000220:Adaptation, Biological; D000818:Animals; D005075:Biological Evolution; D001717:Birds / Q000502:physiology; D002628:Chemoreceptor Cells / Q000502:physiology*; D006234:Handling, Psychological; D009949:Orientation; D010786:Photoreceptor Cells / Q000502:physiology*; D012098:Reproduction