Bugnyar, T., Heinrich, B. (2005). Ravens, Corvus corax, differentiate between knowledgeable and ignorant competitors. Proceedings of the Royal Society of London B: Biological Sciences272 (1573): 1641–1646. ISSN: 0962-8452. PMID16087417. PMC1559847. DOI: 10.1098/rspb.2005.3144.
dx.doi.org
(en) Fraser, O.N., Bugnyar, T. (2010). Do Ravens Show Consolation? Responses to Distressed Others. PLoS ONE 5 (5): e10605. DOI:10.1371/journal.pone.0010605.
Bugnyar, T., Heinrich, B. (2005). Ravens, Corvus corax, differentiate between knowledgeable and ignorant competitors. Proceedings of the Royal Society of London B: Biological Sciences272 (1573): 1641–1646. ISSN: 0962-8452. PMID16087417. PMC1559847. DOI: 10.1098/rspb.2005.3144.
Bugnyar, T., Heinrich, B. (2005). Ravens, Corvus corax, differentiate between knowledgeable and ignorant competitors. Proceedings of the Royal Society of London B: Biological Sciences272 (1573): 1641–1646. ISSN: 0962-8452. PMID16087417. PMC1559847. DOI: 10.1098/rspb.2005.3144.