Any tips for rodent proofing drip irrigation?

There are lots of ground squirrels where I live and I could use some ideas to keep the little boogers from gnawing through the poly tubing. I'm using PVC to run the long stretches between trees/plants in hope that they'll do less damage to it, and I'm going to bury everything but the emitters, but have a bad feeling that they'll be chewing through the poly tubing that will be around the plants. Only other thing I plan on is to place a small saucer at the base of a couple of plants that will fill whenever the system runs in hope that they'll drink from it instead of chewing into the tubing for a drink.
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