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and none of the three subspecies was diagnosable from both other subspecies by any plumage character using the 75% rule
All body-size and plumage-color measurements had smoothly clinal distributions
He and the devoted California birders who helped explain their local birding turf have created a birdfinding guide which will help you figure out where to go
communication and bird society
Watching Birds and none of the threeRevised edition by Jim Flegg. 160 pp. A popular introduction to bird study first published in 1940.
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