Its own reward
Bobwhite quail ( Colinus virginianus ) hatchlings track the direction of human gaze
Great apes' performance in discriminating weight and achromatic color
Metamemory in tufted capuchin monkeys ( Cebus apella )
Chimpanzees ( Pan troglodytes ) do not develop contingent reciprocity in an experimental task
Spatial memory in the grey mouse lemur ( Microcebus murinus )
Socially dependent auditory laterality in domestic horses ( Equus caballus )
A comparative approach to dogs' ( Canis familiaris ) and human infants' comprehension of various forms of pointing gestures
Comparing black-capped ( Poecile atricapillus ) and mountain chickadees ( Poecile gambeli )
How horses ( Equus caballus ) see the world