Why do goldfinches shift preference away from high-fat Nyjer during late spring and summer?
Answer
They need protein intake for breeding and feeding rapidly growing nestlings
The dietary needs of the goldfinch fluctuate dramatically based on their annual breeding cycle. During the late spring and summer, the primary focus shifts to reproduction, demanding significant energy resources for raising their young. Nestlings require substantial protein for rapid growth, leading the adult finches to prioritize seeds with higher protein profiles, such as sunflower hearts, or even natural insect consumption. Consequently, the high-fat content of Nyjer, while excellent for survival in cold weather, becomes a secondary nutritional option during the breeding season.
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