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Orioles
From Page B1
genetic relationship between the two, and recent investigations using DNA sequence information confirm this.
Similar east-west hybrid zones can be seen for 14 pairs of bird species. The most common hybrids are formed between the rufous-sided (east) and the spotted (west) towhees, the yellow-shafted (east) and redshafted (west) flickers, the tuft
97.1%