THE CONCEPTUAL ABILITIES OF PIGEONS - IN THE LABORATORY, PIGEONS CAN SORT OBJECTS INTO CATEGORIES AND RECOGNIZE ABSTRACT RELATIONS - ADVANCED COGNITION MAY LIE WITHIN THE SCOPE OF MORE SPECIES THAN PREVIOUSLY SUPPOSED
Ea. Wasserman, THE CONCEPTUAL ABILITIES OF PIGEONS - IN THE LABORATORY, PIGEONS CAN SORT OBJECTS INTO CATEGORIES AND RECOGNIZE ABSTRACT RELATIONS - ADVANCED COGNITION MAY LIE WITHIN THE SCOPE OF MORE SPECIES THAN PREVIOUSLY SUPPOSED, American scientist, 83(3), 1995, pp. 246-255