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Following your answer to my comment, I deduced the “yellow” color to be more brownish as there is not big bird with really bright yellow color (like the golden oriole). With these parameters I search as well in the ornitho.ch database (all observations given by ornithologist professionals and amateurs) : there was no observation of vulture or eagle in that ...


I have found these papers: http://www.sciencedirect.com/science/article/pii/S0169534713002322 http://www.sciencedirect.com/science/article/pii/S0040580912001360 http://www.ncbi.nlm.nih.gov/pubmed/19416834 http://www.ncbi.nlm.nih.gov/pubmed/21930936 The last two argue that larger groups have better "problem solving" capability, and this is a clear ...

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