The birds aren't after the pea. They're responding to movement when the seed sprouts and dig around hunting for a bug/ the thing that moved. Since the pea only moved once it doesn't move when the bird is digging for food. Since the bird has a brain the size of the pea, it never figures out why it can't find food or what the movement was. If you mulch with a half inch of straw the action happens out of sight and the birds will leave the peas alone. It's easier than wire mesh.
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