Squirrels eating pseudobulbs? Control?

[Orchid Whisperer]

Although I have not caught them red-handed, I suspect squirrels (or possibly mice) are eating the pseudobulbs of some of my plants, especially Cymbidiums.

I already use Metaldehyde bait to control for snails and slugs. Whatever it is seems to have no interest in the leaves. For these reasons I don't suspect snails, slugs or caterpillars.

The culprit is eating an entire pseudobulb or two at a time, mostly the older ones so far. Cymbidiums have been the main target but I have seen damage to My Bletia, a Bulbophyllum, and a Cattleya.

Has anyone else experienced similar damage? How do you control squirrels? The plants are in the back yard, which is where my dogs spend part of the day, they are not deterred. Looking for a repellant.

Poison not an option. Neither are firearms.