Pick the flowers and mind your As and 2s! Categorization by pigeons and infants.

Animal research and human health: Advancing human welfare through behavioral science. ◽

10.1037/10441-017 ◽

2001 ◽

pp. 263-279 ◽

Author(s):

Edward A. Wasserman ◽

Carolyn Rovee-Collier

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