Crows and common ravens do not reciprocally exchange tokens with a conspecific to gain food rewards

Working dogs transfer different tasks in reciprocal cooperation

(2018) Nastassja Gfrerer et al.   Biology Letters

Norway rats (Rattus norvegicus) communicate need, which elicits donation of food.

(2018) Manon K. Schweinfurth et al.   JOURNAL OF COMPARATIVE PSYCHOLOGY

Voluntary food sharing in pinyon jays: the role of reciprocity and dominance

(2016) Juan F. Duque et al.   ANIMAL BEHAVIOUR

Individual performance in socio-cognitive tasks predicts social behaviour in carrion crows

(2015) Claudia A.F. Wascher   BEHAVIOUR

Waiting for better, not for more: corvids respond to quality in two delay maintenance tasks

(2014) Friederike Hillemann et al.   ANIMAL BEHAVIOUR

Evidence of Reciprocal Allonursing in Reindeer,Rangifer tarandus

(2014) Sacha C. Engelhardt et al.   ETHOLOGY

Social Evolution: Reciprocity There Is

(2013) Michael Taborsky   CURRENT BIOLOGY

Behavioral Responses to Inequity in Reward Distribution and Working Effort in Crows and Ravens

(2013) Claudia A. F. Wascher et al.   PLoS One

The relative prevalence of direct, indirect and generalized reciprocity in macaque grooming exchanges

(2012) Bonaventura Majolo et al.   ANIMAL BEHAVIOUR

Reciprocation and interchange of grooming, agonistic support, feeding tolerance, and aggression in semi-free-ranging Barbary macaques

(2011) Charlotte Carne et al.   AMERICAN JOURNAL OF PRIMATOLOGY

Social bonds predict future cooperation in male Barbary macaques, Macaca sylvanus

(2011) Andreas Berghänel et al.   ANIMAL BEHAVIOUR

Corvids can decide if a future exchange is worth waiting for

(2011) V. Dufour et al.   Biology Letters

Ravens Reconcile after Aggressive Conflicts with Valuable Partners

(2011) Orlaith N. Fraser et al.   PLoS One

The quality of social relationships in ravens

(2010) Orlaith N. Fraser et al.   ANIMAL BEHAVIOUR

Monkeys fail to reciprocate in an exchange task

(2010) Marie Pelé et al.   ANIMAL COGNITION

The performance of rooks in a cooperative task depends on their temperament

(2009) Christelle Scheid et al.   ANIMAL COGNITION

Calculated reciprocity after all: computation behind token transfers in orang-utans

(2009) V Dufour et al.   Biology Letters

Token transfers among great apes (Gorilla gorilla, Pongo pygmaeus, Pan paniscus, and Pan troglodytes): Species differences, gestural requests, and reciprocal exchange.

(2009) Marie Pelé et al.   JOURNAL OF COMPARATIVE PSYCHOLOGY

Chimpanzees Help Each Other upon Request

(2009) Shinya Yamamoto et al.   PLoS One

Long-term social bonds promote cooperation in the iterated Prisoner's Dilemma

(2009) A. St-Pierre et al.   PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES

Do chimpanzees reciprocate received favours?

(2008) Alicia P. Melis et al.   ANIMAL BEHAVIOUR

Cooperative problem solving in rooks (Corvus frugilegus)

(2008) A. M Seed et al.   PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES

Long-term reciprocation of grooming in wild West African chimpanzees

(2008) C. M Gomes et al.   PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES

Enhanced social learning between siblings in common ravens, Corvus corax

(2007) Christine Schwab et al.   ANIMAL BEHAVIOUR