A Field Museum researcher said the cold snap may push some birds to shelter in odd places to survive.
The man was pronounced dead before 6 a.m. Tuesday in subzero weather, according to medical examiners.
The flooding occurred about 6 p.m. Tuesday when the sprinkler system went off.
After staying in Monday, Anana the polar bear ventured out Tuesday.
Metra canceled 25 trains Tuesday morning due to "continued hazardous weather conditions."
Flocks of waterfowl more common to the Arctic coasts of northern Canada were seen in Lake Michigan.
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