Marc Bekoff, emeritus professor at the University of Colorado, Boulder, is one of the world's pioneering cognitive ethologists, a Guggenheim Fellow, and co-founder with Jane Goodall of Ethologists for the Ethical Treatment of Animals. What was incredibly interesting is that light avoidance by the stressed crayfish was associated with heightened levels of the brain neurotransmitter serotonin, a chemical also is associated with human moods.
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