I was wondering if anyone has had trouble with something eating Cym. bulbs? I found one plant all chewed up today. Just the bulbs not the leaves. I have a couple of chickens but they've never eaten any of the bulbs before. Maybe a squirrels or possibly a rat?

The plants are in the yard.
A co-worker of mine had the same problem but only the fragrant ones were eaten.
Any advice? I would hate to find more plants eaten. I've grown Cyms. for 4 years now and never had a problem until today.

Thanks.