+1 ^^^. Rodents of all types (squirrels, rats, mice, gophers) just LOVE thermoplastics; they'd chew up the traffic signal conductors in the pullboxes and chew the tops off of photoelectric controls atop street lights.
Two years ago a gray squirrel chewed the ACSR (aluminum conductor steel reinforced) messenger on the overhead electrical service drop (which is also the neutral for a 120/240 volt, split-phase, 3-wire residence) going to my mom-in-laws house. Nothing in the house that ran on 120VAC would work, only the 240VAC water heater, clothes dryer and stove would work, as they don't need a neutral.
The little devil gnawed through it like it was candy, only the 2 black hot legs supported the drop....makes my teeth hurt thinking about it.