"Jaak Panksepp, a psychologist in Ohio, recruited a flock of chickens for research purposes. He played various pieces of music to the birds and noted their reactions. Of all the musical delights sampled by the chickes, Pink Floyd's 'The Final Cut' brought the most notable response. The birds ruffled their feathers, shook their heads slowly from side to side and generally gave a strong impression of superannuated hippies at a Woodstock revival festival.
Panksepp concluded the the feather-ruffling was the avian equivalent of the musical 'chill' or 'tingle' experienced by people when they hear certain musical effects"
--- Mapping the Mind / Rita Carter, Christopher D. Frith
Steve Kotler’s West of Jesus: Surfing, Science and the Origins of Belief:
"This is important information since, from an evolutionary perspective, if spirituality really is biological, that biology should be found not just in human beings but lower orders as well."