Chicago - Just a few weeks after a kangaroo hopped into a bustling Australian airport terminal, a tiny alligator slipped into Chicago's O'Hare International Airport, leaving authorities puzzled about its origins. CNN reports that the 30-centimeter long reptile was spotted underneath an elevator in Terminal 3 by a passenger, who then alerted a security guard. Once it was discovered, an airport worker covered it with a trash can, then used a broom and dustpan to pick it up after which it was handed over to the Chicago Herpetological Society.Huffington Post reports that Chicago Police spokesman Jose Estrada said they had no idea where it came from or how long it had been in the airport for. Jason Hood, head of the Chicago Herpetological Society said the creature was in pretty bad shape, but that they were nursing it back to health. According to the CNN report, clues about the alligator's origins emerged on Twitter, when a user posted pics of a man holding a similar animal on the Blue Line train, which goes to O'Hare. @cbs2mai: Maybe same alligator I saw on Blue Line on 11.01. I got off @ Cumberland, but alli & owner went further. pic.twitter.com/MXC2TLglZq— CubsCat (@CubsCat) November 3, 2013 Authorities suspect that the passenger must have realised that he wouldn't be able to board with the scaly little guy, so just set him free in the terminal instead.