A maintenance worker found the alligator, which is about 30 centimetres long on Friday in Terminal 3.
Chicago Police spokesman Jose Estrada said today an officer captured the reptile by putting a trash can over it.
The gator is now being cared for by the Chicago Herpetological Society. The group's president says the animal is in "pretty bad shape" and the society is trying to nurse it back to health.
Estrada says investigators aren't sure how long the animal was at the airport or where it came from.
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