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As we move from Spain towards the east however, it starts getting interesting as soon as we reach Italy. Italy has an almost endemic … well … “form” of Sparrow, the Italian Sparrow , whose taxonomic affinities and rank have been a matter of dispute ever since scientists started to think about it.
It seems that the Red-billed Leiothrix can be vocally dominant (it accounts for 37% of an entire bird community soundscape in northern Italy) and can influence the singing behavior, particularly of native Eurasian Blackcaps and European Robins (in Portugal and Italy). What a weird world. Better watch them in the wild.
The chance that this was a real Turkey are not great, and the chance that Columbus actually brought breeding stock from Honduras to Spain is not great, so maybe, maybe not. Dates of first arrival listed by Schorger (1966) are: Italy 1520, Germany 1530, France 1538, England 1541, Denmark and Norway 1550, Sweden 1556.
The source of this ranking, BirdLife International, lists Bolivia as currently having 1,439 bird species, including 18 breeding endemics. Like most maps, colors are used to indicate seasonal status (breeding resident, Austral migrant/visitor, Boreal migrant, etc.). Distribution maps are also different from other field guides.
We now know a lot more, and the following information is largely based on the excellent work of our local bird data compiler Armin Konrad , who was amongst the first to notice the die-off in the first place and was also instrumental in coordinating the surveys and research that finally led to the identification of the culprit!
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