What key feature on the tail distinguishes a Western Kingbird from a Cassin's Kingbird when the tail is spread?
Answer
The Western Kingbird usually exhibits white outer tail feathers
When attempting to differentiate between the Western Kingbird and the Cassin's Kingbird, the tail pattern provides a reliable distinction, particularly when the bird spreads its tail during display or flight adjustments. Both species possess dark tails, but a key difference lies in the edges. The Western Kingbird typically displays white outer tail feathers, which become visible when the tail is spread open. Conversely, the tail of the Cassin's Kingbird is noted for being entirely dark, lacking these contrasting white outer margins. This subtle but important field mark is crucial for accurate identification when observing birds in transitional zones where their ranges overlap.
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