What is the easternmost geographical boundary mentioned for the Willow Warbler's core summer breeding territory?
Answer
The Anadyr River basin
The summer residence of the Willow Warbler spans a vast territory across northern and temperate Europe and extends significantly eastward into the Palearctic region. The most extreme eastern limit defined for this core breeding zone stretches across Siberia, reaching as far as the Anadyr River basin. This massive geographical spread confirms the bird's status as a widespread breeder across this immense northern expanse.
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