Avian Ecologist Update

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According to Mike Ward, an avian ecologist who contributed to the Illinois study, birds don’t need to migrate to avoid cold.  They just need to be able to eat enough to maintain their high metabolism until the return of their primary food source, earth worms and insects.  Most important for enabling robins to spend winters farther north is availability of new sources of winter food, namely the spread of abundant berries of exotic, invasive shrubs that remain on branches through the cold of winter.

http://www.washingtonpost.com/blogs/capital-weather-gang/wp/2014/01/31/robin-invasion-red-breasted-birds-no-longer-a-harbinger-of-spring/

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