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Prior, H.; Schwarz, A.; Güntürkün, O. (2008). "Mirror-Induced Behavior in the Magpie (Pica pica): Evidence of Self-Recognition". PLOS Biology. 6 (8): e202. doi:10.1371/journal.pbio.0060202. PMC 2517622. PMID 18715117.
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Gallego-Abenza, M.; Loretto, M. C.; Bugnyar, T. (2020). "Memorial University Libraries - Proxy Login". Ethology. 126 (4): 413–422. doi:10.1111/eth.12986. PMC 7079088. PMID 32201438.
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Blum, C. R.; Fitch, W. T.; Bugnyar, T. (2020). "Memorial University Libraries - Proxy Login". Frontiers in Psychology. 11: 581794. doi:10.3389/fpsyg.2020.581794. PMC 7609869. PMID 33192900.

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Stahler, Daniel; Heinrich, Bernd; Smith, Douglas (1 August 2002). "Common ravens, Corvus corax, preferentially associate with grey wolves, Canis lupus, as a foraging strategy in winter". Animal Behaviour. 64 (2): 283–290. doi:10.1006/anbe.2002.3047. ISSN 0003-3472. S2CID 53176223.
Vucetich, John A.; Peterson, Rolf O.; Waite, Thomas A. (1 June 2004). "Raven scavenging favours group foraging in wolves". Animal Behaviour. 67 (6): 1117–1126. doi:10.1016/j.anbehav.2003.06.018. ISSN 0003-3472. S2CID 52063060.

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