Hello, I'm new to gardening and think I have bitten off more than I can chew. Now that my plants are finally coming up something is eating them! Whatever it is particularly likes my soybeans, sunflowers, and squash. But my wheat, oats, carrots, mustard greens, and scallions aren't touched. I do know that we have ants and birds, but I don't know which is attacking my food. I just need to know if I should try to cover them to keep the birds away or spray them to kill the ants. From the images, what do you guys think?