angryphase writes: "According to animal behaviour experts from Queens University (Belfast), the belief that crustaceans are incapable of feeling pain may be false. After various research groups have delved into the nervous systems of invertebrates, studies have shed light on what '[...] has become an unlikely obsession for some scientists.' Professor Robert Elwood and his colleagues '[...] set about finding an answer by daubing acetic acid on to the antennae of 144 prawns.' A thankless task, that has not convinced many in the field of pain research. As Richard Chapman from the University of Utah (Salt Lake City) commented, 'Even a single-cell organism can detect a threatening chemical gradient and retreat from it [...] But this is not sensing pain.'"