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(Henry T. McLin / Flickr)

The migratory birds are starting to nest in the area, but their nests don't look like those found in trees. That's because purple martins, which spend their winters in South America, now rely almost entirely on man-made nests when they arrive each spring. 

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You don't have to be an expert birder or ecologist to enjoy songs and calls from native and foreign birds in Chicago this time of year. Here's what to listen for.