I have been observing worms in my 30 acres of uncut hay. They have chewed the leaves off 50%, leaving the stem and head, other area remain untouched.The rest of the plant starts a dry down process. Finding 1/ sq. ft. They are on the cool, moist, darker soil areas during the day, spreading out as the dew falls.Old leaves , on the soils, seem to be a favorite hiding place. They have traveled over 1 mile, field to field in just 2 nights. The legumes have remained untouched, for now. I have also noticed a fly that is eating the timothy heads. Don't know what that is yet. Now we pay for the mild winter.