Jokes aside about flying squirrels, nuts served on planes and bushy-tailed passengers, squirrels and planes do not actually mix. At least not on Tuesday at Orlando International Airport, where an unidentified passenger hadn't gotten the memo.

She boarded her Cleveland-bound Frontier Airlines flight toting a cage containing the furry occupant. She did her due diligence by noting on her reservation that she would be bringing an emotional support animal, Frontier said in a statement. She even had the animal cleared by TSA's X-ray machine. She just failed to notify the airline that her companion was a squirrel.

Once onboard, the woman was told that squirrels are rodents — and rodents are not welcome. (So don't get any ideas, proud hamster, rat and mouse owners).

The woman refused to get off the flight, Frontier said, and Orlando police stepped in.