Norway rats reciprocate help according to the quality of help they received

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(2013) G. G. Carter et al.   PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES

Reciprocal cooperation between unrelated rats depends on cost to donor and benefit to recipient

(2012) Karin Schneeberger et al.   BMC EVOLUTIONARY BIOLOGY

Mechanisms of reciprocity in primates: testing for short-term contingency of grooming and food sharing in bonobos and chimpanzees

(2012) Adrian V. Jaeggi et al.   EVOLUTION AND HUMAN BEHAVIOR

The Labor Illusion: How Operational Transparency Increases Perceived Value

(2011) Ryan W. Buell et al.   MANAGEMENT SCIENCE

Size-dependent task specialization in a cooperative cichlid in response to experimental variation of demand

(2010) Rick Bruintjes et al.   ANIMAL BEHAVIOUR

Contingent cooperation between wild female baboons

(2010) D. L. Cheney et al.   PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA

Supply and demand determine the market value of food providers in wild vervet monkeys

(2009) C. Fruteau et al.   PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA