1. The term animal(s) is loosely used throughout to refer to nonhuman animals. The term animal(s) is loosely used throughout to refer to nonhuman animals.
2. Operant conditioning chamber; http://en.wikipedia.org/wiki/Operant_conditioning_chamber Operant conditioning chamber; http://en.wikipedia.org/wiki/Operant_conditioning_chamber
3. display self-doubt" like humans;Gill V.;BBC Earth News,2011
4. Robotic milking in dairy farming;Rossing W.;NJAS Wageningen Journal of Life Sciences,1997