ALWAYS IN SEASON: Movement of birds remains a mystery
Published 09/09/2012, Grand Forks Herald
Perhaps invasion is too strong a term, because it implies malevolent intent. Nevertheless, it is the word that scientists use to describe what’s going on. The species in question is the red crossbill. Its invasion may be abetted by its close relative, the white-winged crossbill.Word count: 709
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