how to stop rodents from eating my cactus??
 

I live in the high desert of southern California. Two weeks ago, I put
in a small cactus garden with red yucca, dollar prickly pear and
mission cactus. My problem is the indigenous kangaroo rats. They've
decided that the mission cactus is a tasty treat. Is there something I
can do to discourage them from feasting without harming them or the
plants?

TIA.

Lou