From mid-November 2015 through February 2016, scientists used GPS transmitters to track the movements of Canada geese near Midway International Airport in Chicago. They discovered that—in the colder months, at least—some geese are hanging out on rooftops, in a rail yard and in a canal close to Midway’s runways. This behavior increases the danger of collisions between geese and airplanes, the researchers say.
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Source: Phys.org