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Carl Sagan & Ann Druyan – Shadows of Forgotten Ancestors (1992)

When chimpanzees born in the wild were confronted with a full-length mirror, at first–like other animals–they thought the reflection was someone else. But within a few days they had it figured out. Then, they’d use the mirror to preen, and to examine inaccessible parts of themselves, looking over their shoulders to view their backs, for example. … Watching themselves in the mirror wearing hats is also a wildly popular and apparently gripping experience.

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