How do the wing-bars appear on a Willow Flycatcher in fresh plumage compared to older, worn plumage?
Answer
more conspicuous, often showing slightly buffy tips
The visibility and appearance of the Willow Flycatcher's wing-bars are highly dependent on the bird's feather condition, relating directly to when it arrived on the breeding grounds. When the bird is freshly arrived, possessing fresh plumage shortly after molt, the two white wingbars formed by the pale tips of the median and greater wing-coverts are described as being more conspicuous. These fresh bars often show slightly buffy tips. As the bird progresses through the breeding season, this plumage experiences wear, causing the wing-bars to appear progressively duller and less noticeable.
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