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CTA spokeswoman Lambrini Lukidis said releasing the photos provides a good reminder that 3,600 cameras are keeping a close eye on the transit system.

“If a more serious crime is happening in our system,” she said, “there are ways for us to work with investigators and the police department.”

The decision to release the photos also reflects the public interest in a very unusual sighting, Lukidis said. “We’ve had deer on train platforms and roosters on buses and trains, but this is the first reptile, at least that I’m aware of.”