Up north, it was squirrels, they caused lots of outages............In one case a single squirrel took out all but 1 of the 69kV (high side) fuses when it got across the 12kV (low side) bus. Lots of damage inside the substation. Squirrel did not survive, but was well done.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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