Breeding Research Rights Switzerland 
10,000 Birds
MAY 10, 2015
You see, it clearly resembles a hybrid between the Spanish and the House Sparrow, and an ancient hybrid event was long suspected to be the source of its existence – with recent research indicating that apparently this isn’t the case after all.
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. In what has become the modern-day traditional method of organization, species are listed and described on the left-hand page and illustrative plates are on the right. More on Species Accounts.
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