Primates are capable of high levels of cognition; some make tools and use them to acquire foods and for social displays;[2][3] some have sophisticated hunting strategies requiring cooperation, influence and rank;[4] they are status conscious, manipulative and capable of deception;[5] they can recognise kin and conspecifics;[6][7] they can learn to use symbols and understand aspects of human language including some relational syntax, concepts of number and numerical sequence.[8][9][10]
^Boesch C, Boesch H (1990). "Tool use and tool making in wild chimpanzees". Folia Primatologica; International Journal of Primatology. 54 (1–2): 86–99. doi:10.1159/000156428. PMID2157651.
^Westergaard GC, Lundquist AL, Haynie MK, Kuhn HE, Suomi SJ (June 1998). "Why some capuchin monkeys (Cebus apella) use probing tools (and others do not)". Journal of Comparative Psychology. 112 (2): 207–211. doi:10.1037/0735-7036.112.2.207. PMID9642788.
^Fujita K, Watanabe K, Widarto TH, Suryobroto B (1997). "Discrimination of macaques by macaques: The case of sulawesi species". Primates. 38 (3): 233–245. doi:10.1007/BF02381612. S2CID21042762.
^Call J (June 2001). "Object permanence in orangutans (Pongo pygmaeus), chimpanzees (Pan troglodytes), and children (Homo sapiens)". Journal of Comparative Psychology. 115 (2): 159–171. doi:10.1037/0735-7036.115.2.159. PMID11459163.
^Itakura S, Tanaka M (June 1998). "Use of experimenter-given cues during object-choice tasks by chimpanzees (Pan troglodytes), an orangutan (Pongo pygmaeus), and human infants (Homo sapiens)". Journal of Comparative Psychology. 112 (2): 119–126. doi:10.1037/0735-7036.112.2.119. PMID9642782.
^Gouteux S, Thinus-Blanc C, Vauclair J (2001). "Rhesus monkeys use geometric and nongeometric information during a reorientation task". Journal of Experimental Psychology: General. 130 (3): 505–519. doi:10.1037/0096-3445.130.3.505. PMID11561924.