Migration Records of the Red Bat, Lasiurus borealis

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Abstract
Sometime during the night of October 18–19, 1955, two male red bats were killed when they struck the 1,472 foot high Empire State Building in New York City, presumably during their migration flight southward. The bats were found on one of the roof set-backs of the building. They were picked up by maintenance men of the building who also gathered 156 dead birds of 18 species that struck the building early on the morning of October 19. The maintenance men claim that the bats struck the building at about 11 o'clock on the night of October 18, when the skies were clear, but that the birds were killed at about 8 o'clock on the morning of October 19, when cloud ceiling heights, according to local weather reports, dropped to about 1,100 feet above ground level.

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