OK, I didn't realize that.
NY Times article
By
C. Claiborne Ray
April 22, 2013
- Q. Does bird mating ever cross the species line?
A. “Many birds occasionally mate with members of other bird species, producing hybrid offspring,” said Irby J. Lovette, director of the Fuller Evolutionary Biology Program at the Cornell Lab of Ornithology.
In fact, Dr. Lovette said, about 10 percent of the world’s 10,000 bird species are known to have bred with another species at least once, either in the wild or in captivity.
This might work, not sure:
In fact,
Dr. Lovette said, about 10 percent of the world’s 10,000 bird species are known to have bred with another species at least once, either in the wild or in captivity. For example, in the eastern United States, native black ducks have hybridized so often with the more abundant mallard ducks that pure black ducks have become rare.
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The New York Times
https://www.nytimes.com/2013/04/23/science/does-bird-mating-ever-cross-the-…