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Researchers found that tools from the Pleistocene sites resembled capuchin-made lithic deposits, resulting in the theory that the American population would have been much older than thought.
Social interactions are helpful. These include giving and receiving grooming, foraging nearby and helping each other in conflicts by fighting or making aggressive sounds and facial expressions.
North American red squirrels produce a range of sounds, but their distinctive rattle call may have more to do with identifying themselves than warning off other squirrels.