Something is Chewing my Flax

Something is chewing my flax. I am pretty worried. This happened last year and I really do not want to repeat the disaster. Here’s the evidence:

It fells a stalk. Some of the stalks are chewed on an angle, but some are chewed straight across:

sawed stalk

Then it chews the stalk into little pieces:

June 14 chewed stems close

June 14 chewed stems

It leaves a pile of chewed up stalks on the ground:

debris on ground