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Nighttime temperatures in parts of the country dipped last night. Take a look at this map that shows this past week's minimum temperatures. Then answer these questions: Where were the temperatures near freezing? How do you think cold nighttime temperatures could affect hummingbirds? If you were a hummer, what would you do for protection? Map: NOAA     Copyright 1997-2011 Journey North. All Rights Reserved. Questions or comments? Contact us.