Breeding Ducks Research Switzerland 
10,000 Birds
MARCH 3, 2020
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.
10,000 Birds
FEBRUARY 5, 2012
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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