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The Counting Chimp
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Animal OdditiesMay 07, 2026

The Counting Chimp

The Counting Chimp Sheba lived at Ohio State University. Researcher Sarah Boysen taught her Arabic numerals. The chimp matched digits 0 through 4 to quantities. Then Boysen hid oranges in two locations. Sheba mentally added them and pointed to the correct number. She was doing arithmetic without ever seeing the totals.

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