Targeted helping by a wild adolescent male chimpanzee (Pan troglodytes verus): evidence for empathy?

Altruism in Forest Chimpanzees: The Case of Adoption

(2010) Christophe Boesch et al.   PLoS One

Chimpanzee social intelligence: selfishness, altruism, and the mother–infant bond

(2009) Satoshi Hirata   PRIMATES

Capuchin Monkeys Display Affiliation Toward Humans Who Imitate Them

(2009) A. Paukner et al.   SCIENCE

Relatedness in wild chimpanzees: Influence of paternity, male philopatry, and demographic factors

(2008) Eiji Inoue et al.   AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY

Chimpanzees do not take advantage of very low cost opportunities to deliver food to unrelated group members

(2008) Jennifer Vonk et al.   ANIMAL BEHAVIOUR

Helping behaviour and regard for others in capuchin monkeys (Cebus apella)

(2008) J. L. Barnes et al.   Biology Letters

Capuchin monkeys are sensitive to others' welfare

(2008) Venkat R. Lakshminarayanan et al.   CURRENT BIOLOGY

Arboreal nesting as anti-predator adaptation by savanna chimpanzees (Pan troglodytes verus) in southeastern Senegal

(2007) J.D. Pruetz et al.   AMERICAN JOURNAL OF PRIMATOLOGY

Putting the Altruism Back into Altruism: The Evolution of Empathy

(2007) Frans B.M. de Waal   Annual Review of Psychology