Guillermo Reyes was driving his Chevy in Mexico City this past January when he got pulled over at a checkpoint. He had been drinking some, but he was hoping that the guards would not notice. Anyway, this was one of those routine checkpoints... no worries.
The police approached Reyes' car and started to ask some routine questions when they heard a voice in the car say, "He's drunk, he's drunk." The officer could not see anybody, but upon careful inspection found the "rat". The rat was a bird! It was Reyes' pet parrot that had "ratted" him out!
Come to think about it, I've always wondered what a jailbird was... now I know.