Why cardinals can be good for your health

The birds seem to buffer humans from West Nile virus, according to a new study, especially in cities with more patches of old-growth forest.

The northern cardinal is one of North America's most familiar songbirds. From the scarlet feathers and pointed crest of males to the rich, rhythmic songs of both sexes, it's an unmistakable icon of countless American forests, parks and backyards.

And as a new study demonstrates, northern cardinals are much more than just scenery and a soundtrack. As part of eastern North America's native biodiversity, they can also play a key role in keeping ecosystems — including humans — healthy.

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