What adornments are sometimes used on the outer surface of the Willow Flycatcher's nest structure?
Answer
Lichens or moss.
The construction of the Willow Flycatcher's nest demonstrates careful craftsmanship, resulting in a deep, compact cup shape. The primary structural components consist of finely woven plant materials such as grasses, rootlets, and thin strips of bark, which are expertly interwoven to provide stability. To further camouflage the nest, which is typically situated within a fork of a small branch or sturdy twig inside dense cover, the outer surface may be strategically covered or decorated. These decorative elements are specifically derived from the immediate environment, often consisting of lichens or mosses, helping the structure blend seamlessly with the surrounding twigs and branches.
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