Tag Archives: box elder

Female Evening Grosbeak

This gallery contains 5 photos.

The evening grosbeaks (Coccothraustes vespertinus) are behaving differently this winter. Our usual pattern of evening grosbeak sightings are consistent with their irruptive (irregular) migratory behavior, which is often in response to food supply. They usually arrive in a flock each … Continue reading

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Irruptive Species

Irruptive bird species are those that respond to irregular changes in the food supply. The availability of seeds, berries, and small rodents, for example, can fluctuate wildly from year to year and season to season. Flocks of grosbeaks, pine siskins, … Continue reading

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Evening Grosbeak

This gallery contains 5 photos.

Many of the walkways at¬†Oregon State University are lined with elms.¬†Each fall, when I was at OSU, I eagerly awaited the arrival of the evening grosbeaks (Coccothraustes vespertinus). For a day or two thousands (or so it seemed) of these … Continue reading

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