When less is more: like humans, chimpanzees (Pan troglodytes) misperceive food amounts based on plate size

What counts for ‘counting’? Chimpanzees, Pan troglodytes, respond appropriately to relevant and irrelevant information in a quantity judgment task

(2013) Michael J. Beran et al.   ANIMAL BEHAVIOUR

Perception of the Ebbinghaus illusion in four-day-old domestic chicks (Gallus gallus)

(2013) O. Rosa Salva et al.   ANIMAL COGNITION

Memory and foraging theory: chimpanzee utilization of optimality heuristics in the rank-order recovery of hidden foods

(2012) Ken Sayers et al.   ANIMAL BEHAVIOUR

Bantams (Gallus gallus domesticus) also perceive a reversed Zöllner illusion

(2012) Sota Watanabe et al.   ANIMAL COGNITION

Size of food bowl and scoop affects amount of food owners feed their dogs

(2011) M. Murphy et al.   JOURNAL OF ANIMAL PHYSIOLOGY AND ANIMAL NUTRITION

Quantity judgments of auditory and visual stimuli by chimpanzees (Pan troglodytes).

(2011) Michael J. Beran   JOURNAL OF EXPERIMENTAL PSYCHOLOGY-ANIMAL LEARNING AND COGNITION

Perception of food amounts by chimpanzees based on the number, size, contour length and visibility of items

(2008) Michael J. Beran et al.   ANIMAL BEHAVIOUR

Pigeons perceive the Ebbinghaus-Titchener circles as an assimilation illusion.

(2008) Noriyuki Nakamura et al.   JOURNAL OF EXPERIMENTAL PSYCHOLOGY-ANIMAL LEARNING AND COGNITION