Recently-published media reports have suggested that caimans, alligator-like creatures that can grow to be 10-feet long, have taken up residence at a huge lagoon system west of the Brazilian city, near both the Olympic golf course and the Olympic village that will serve as the residence of the athletes during the duration of the Games.

According to BBC News, as many as 6,000 of the creatures are believed to be living in that lagoon system. Experts told the British news agency that the creatures may have been attracted there because pollution has caused the lagoon waters to become warmer.