“Grooming releases endorphins--pleasant, reinforcing chemical signals. The pleasure derived from grooming seems to outweigh the pain of the occasional bite.” LyingCommunicationDeceitAnimal BehaviorEthologyThe Wisdom Of LokiPtera HunterDeception In NatureCleaner FishWrasses Book:The Wisdom of Loki: The Art of Lying in the Natural World Source: The Wisdom of Loki: The Art of Lying in the Natural World