Hello, i started several thousand jbp and jrp seedlings a couple weeks ago. many have germinated, but i have noticed most of the seedlings have been uprooted and the first needles eaten, but the root left. I first thought it might be a mouse or mole and moved the flats up off the ground and onto a bench. However, the seedlings continue to be eaten and uprooted. Am i dealing with a bird or what? also, should i cover the flats with a net to deter the pests? thank you!