The reports are being investigated by the US-based Mutual UFO Network (MUFON).
MUFON is the world's largest organisation dedicated to UFO and alien research, but also looks at other paranormal cases reported to it.
The Mothman creature stems from West Virginia folklore.
It was a legendary creature reportedly seen in the Point Pleasant area from November 12, 1966, to December 15, 1967.
The first newspaper report was published in the Point Pleasant Register dated November 16, 1966, entitled "Couples See Man-Sized Bird ... Creature ... Something."
It was later popularised by John Keel in his 1975 book, The Mothman Prophecies, which claimed there were supernatural events related to the sightings.
It was turned into a film starring Richard Gere in….
Roger Marsh, MUFON director of communications, said: "A Mothman-type creature is being reported in Chicago by three separate witnesses over a four-hour period, according to three witness reports from the MUFON witness reporting database.
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