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Submissions from 2015

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Laterality Enhances Numerical Skills in the Guppy, Poecilia reticulata, Marco Dadda, Christian Agrillo, Angelo Bisazza, and Culum Brown

Submissions from 2012

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Grey Parrot Number Acquisition: the Inference of Cardinal Value from Ordinal Position on the Numeral List, Irene M. Pepperberg and Susan Carey

Submissions from 2006

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Grey Parrot (Psittacus erithacus) Numerical Abilities: Addition and Further Experiments on a Zero-Like Concept, Irene M. Pepperberg

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Ordinality and Inferential Abilities of a Grey Parrot (Psittacus erithacus), Irene M. Pepperberg

Submissions from 2005

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Number Comprehension by a Grey Parrot (Psittacus erithacus), Including a Zero-Like Concept, Irene M. Pepperberg and Jesse D. Gordon

Submissions from 2000

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Primate Numerical Competence: Contributions Toward Understanding Nonhuman Cognition, Sarah T. Boysen and Karen I. Hallberg

Submissions from 1999

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Overcoming Response Bias Using Symbolic Representations of Number by Chimpanzees (Pan troglodytes), Sarah T. Boysen, Kimberly L. Mukobi, and Gary G. Berntson

Submissions from 1997

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Language-Naive Chimpanzees (Pan troglodytes) Judge Relations Between Relations in a Conceptual Matching-to-Sample Task, Roger K.R. Thompson, David L. Oden, and Sarah T. Boysen

Submissions from 1996

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Quantity-Based Interference and Symbolic Representations in Chimpanzees (Pan troglodytes), S. T. Boysen, G. G. Berntson, M. B. Hannan, and J. T. Cacioppo

Submissions from 1995

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Responses to Quantity: Perceptual Versus Cognitive Mechanisms in Chimpanzees (Pan Troglodytes), Sarah T. Boysen and Gary G. Berntson

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Indicating Acts During Counting by a Chimpanzee (Pan troglodytes), Sarah T. Boysen, Gary G. Berntson, Traci A. Shreyer, and Michelle B. Hannan

Submissions from 1994

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Numerical Competence in an African Gray Parrot (Psittacus erithacus), Irene M. Pepperberg

Submissions from 1993

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Counting in Chimpanzees: Nonhuman Principles and Emergent Properties of Number, Sarah T. Boysen

Submissions from 1992

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Counting as the Chimpanzee Views It, Sarah T. Boysen

Submissions from 1989

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Numerical Competence in a Chimpanzee (Pan troglodytes), Sarah T. Boysen and Gary G. Berntson