What is the fundamental energy source that fuels the Willow Warbler's transcontinental migration?
Answer
Stored fat reserves accrued through intense feeding
The energy required to sustain the long flight south to wintering grounds is directly derived from stored fat reserves. This necessity dictates the significant increase in feeding intensity, known as hyperphagia, that occurs in autumn. The bird shifts its focus from reproductive needs to accumulating this high-energy density fuel source from arthropods, as this stored fat is the sole physical mechanism that powers the demanding, non-stop migratory journey.
Related Questions
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