LONDON (KGO) -- Imagine seeing a squirrel on BART during your morning commute -- one was running loose on a train in London's Underground.
The man who shot video of the animal says some people were freaked out at first because they thought it was a rat.
The squirrel rode one stop before reaching his apparent destination and exiting through the train's doors.
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Riders watch squirrel take London Underground, exit through train doors
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