Pairs of cooperating cleaner fish provide better service quality than singletons.
D000818:Animals; D003299:Cooperative Behavior; D005247:Feeding Behavior / Q000502:physiology*; D005260:Female; D005399:Fishes / Q000502:physiology*; D005716:Game Theory; D008297:Male; D008954:Models, Biological; D009093:Mucus; D010271:Parasites; D012727:Sex Characteristics; D013550:Swimming / Q000502:physiology; D013559:Symbiosis