Which tree species strongly influence the Willow Warbler's preferred breeding habitat?
Answer
Willow (Salix) and alder (Alnus) trees
The Willow Warbler displays a strong preference for habitats rich in willow (Salix) and alder (Alnus) trees during the breeding season in northern latitudes. This habitat selection is directly linked to the availability of their primary food sources, as these specific tree types support the dense communities of small, soft-bodied insects, such as aphids and small flies, which constitute the majority of the warbler's sustenance necessary for raising young.
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