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M. A. Arbib (2011) From mirror neurons to complex imitation in the evolution of language and tool use. Annual Review of Anthropology 40:257–73.
N. E. Collias (1997) The origin and evolution of nest building by passerine birds. Condor 99:253–69.
A. E. Goldberg (2003) Constructions: A new theoretical approach to language. Trends in Cognitive Science 7(5):219–24.
G. R. Hunt (1996) Manufacture and use of hook-tools by New Caledonian crows. Nature 379(6562):249–51. doi: 10.1038/379249a0
F. A. Stewart , A. K. Piel & W. C. McGrew (2011) Living archaeology: Artefacts of specific nest site fidelity in wild chimpanzees. Journal of Human Evolution 61(4):388–95. doi: 10.1016/j.jhevol.2011.05.005