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| Description: In this drawing, made from a video, the monkey on the right watches as the one on the left exchanges a token for a reward. Later, the observing monkey may refuse a lesser reward. Picture Stats: Views: 220 Filesize: 242.22kB Height: 475 Width: 372 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=41804 |