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| Description: Psychologists sometimes use animals to study learning, memory, emotion, and social behavior. Here, Frans de Waal observes a group of chimpanzees socializing in an outdoor play area. Picture Stats: Views: 148 Filesize: 795.05kB Height: 451 Width: 632 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=41457 |