What is Pain in crustaceans?
{{no sources|date=April 2024}} '''Pain in crustaceans''' is the debate of whether or not [[Crustacean|crustaceans]] can feel [[pain]], and in what way they feel pain. Pain is a complex state, and it may involve [[suffering]]. It is difficult to see if an animal feels pain. In general, pain is caused by harmful [[Stimulus (psychology)|stimuli]], and animals that feel pain will avoid these stimuli. To actually feel the pain, the animal also needs a more or less complex [[nervous system]]. Crustaceans fulfil several criteria. They do have a complex nervous system, they have [[Opioid receptor|opioid receptors]], and they react less, when they are given [[Anesthetic|anesthetics]] (painkillers). Also, they show some degree of [[learning]] how to avoid the bad stimulus. {{Animal welfare}} [[Category:Nature]] {{Stub}}