A juvenile Lesser Whitethroat ringed in early August had opportunistically replaced its right outer tail-feathers while retaining all its juvenile feathers on the left-side.
The photo provides a good example of the differences between juvenile and adult tail-feathers in this species.
Right: T6-T5=adult; T4 missing; T3 growing; T2-T1=juvenile
Left: All 6 are retained juvenile tail feathers
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| Lesser Whitethroat (Age3J) |
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