One, two, three, four, or is there something more? Numerical discrimination in day-old domestic chicks

Bears ‘count’ too: quantity estimation and comparison in black bears, Ursus americanus

(2012) Jennifer Vonk et al.   ANIMAL BEHAVIOUR

Putting the elephant back in the herd: elephant relative quantity judgments match those of other species

(2012) Bonnie M. Perdue et al.   ANIMAL COGNITION

Large quantity discrimination by North Island robins (Petroica longipes)

(2012) Alexis Garland et al.   ANIMAL COGNITION

Relative quantity judgments in South American sea lions (Otaria flavescens)

(2011) José Z. Abramson et al.   ANIMAL COGNITION

Small and large number discrimination in guppies

(2011) Laura Piffer et al.   ANIMAL COGNITION

Spontaneous discrimination of possible and impossible objects by newly hatched chicks

(2011) L. Regolin et al.   Biology Letters

Newborn infants perceive abstract numbers

(2009) V. Izard et al.   PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA

Arithmetic in newborn chicks

(2009) R. Rugani et al.   PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES

Quantity judgments of sequentially presented food items by capuchin monkeys (Cebus apella)

(2008) Theodore A. Evans et al.   ANIMAL COGNITION

Relative quantity judgment by Asian elephants (Elephas maximus)

(2008) Naoko Irie-Sugimoto et al.   ANIMAL COGNITION

How the great apes (Pan troglodytes, Pongo pygmaeus, Pan paniscus, Gorilla gorilla) perform on the reversed reward contingency task II: Transfer to new quantities, long-term retention, and the impact of quantity ratios.

(2008) Jana Uher et al.   JOURNAL OF COMPARATIVE PSYCHOLOGY

Discrimination of small numerosities in young chicks.

(2008) Rosa Rugani et al.   JOURNAL OF EXPERIMENTAL PSYCHOLOGY-ANIMAL LEARNING AND COGNITION