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I will assume that you are talking about Mallards, although other wildfowl are likely to exhibit similar behaviors. Mallards aren't actually solitary during the summer, instead they form breeding pairs. They form groups (sords) in the winter to migrate and for protection while moulting. ...


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From this paper about black-headed gulls responding to a hedgehog: The gull might peck the intruder, or strike it with its feet. Pecks were mostly directed at the hedgehog's head and might be delivered after a horizontal approach with the wings partly lifted. Although not directed at the eyes specifically, they observed the birds directing attacks ...


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Thank you for these answers. My robin sightings decreased over the first few weeks since I wrote this, however they're back in full force now. This made me curious enough to do further research, and I happened upon two fact sheets about American Robins, whose scientific name is Turdis Migratorius, meaning Migrating Thrush. I've extrapolated data from a ...


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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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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 ...



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