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A maintenance worker discovered the alligator, which is about a foot (30 centimeters) long, on Friday in Terminal 3, Chicago Police spokesman Jose Estrada said Sunday.
An officer captured the reptile by putting a trash can over it.
``We don't know where it came from or how long it'd been residing in the airport facilities,'' Estrada said. ``It's one of those random incidents.''
The gator is now being cared for by the Chicago Herpetological Society.
``It was in pretty bad shape,'' said Jason Hood, the group's president. ``We're trying to get it healthy and find a place for it.''
He said the gator would likely head to an out-of-state alligator farm once authorities give the organization the all-clear to release the animal.
No one was injured.
