Where did all the robins come from?
Question: Two weeks ago hundreds of robins appeared in Vail. This is very unusual to occur in January. What is the environmental reason for this?
Answer: The American robin, in Colorado, can be both migratory and a resident during winter. Migration can be both latitudinal or elevation related. During winter, the American robin tends to, but not always, form large flocks. More than likely, the American robin flock that was seen in Vail is exhibiting winter resident behavior. They are most likely going to found in places where more food is available for them, such as where ornamental berries occur, and where temperatures are relatively warmer, hence low lying valleys.
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