Monday, January 2, 2017

House Finch

House Finches are now among the most common North American birds. Once they were restricted to the desert Southwest. The history of a captive flock’s liberation in New York and subsequent spread west is well known (and can be read about elsewhere in this blog).

I was not so aware of the House Finch’s expanding western range. There some birds undergo short, seasonal movements. After arriving to a new area, in snowy winters they often move along mountain valleys until they get to cities. They stay in the towns if they encounter sufficient bird feeders and relatively little snow. Within a decade, populations become year-round residents (Badyaev et al. 2012).

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