Breeding Groups Science Sweden 
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. This is more than eBird reports–a checklist generated from the citizen science database lists only 1,413 species. Clearly, this is an under-birded country. .
10,000 Birds
MAY 19, 2011
If migration evolved many times in birds, then it would be worth asking if it evolved in birds more often than in other groups of vertebrates. Loons hardly ever fly when they are on their breeding grounds or their winter-water, but the migration is for many loons a non-trivial distance. Consider the implications. 2 PIERSMA, T.,
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