Researchers found that as the flock size of European goldfinch (Carduelis carduelis) increased, the time needed to find new food patches also increased because large populations

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As the flock size of European goldfinch increases, more and more birds are trying to find food in the same area, which leads to increased competition for food. Therefore, more time is needed to find new food patches, and the chance of encountering other birds looking for food also increases. Thus, choice D - face increased competition for food - is the most suitable option.

Researchers Found That as the Flock Size of European Goldfinch