I had an excellent stand of heirloom field corn (Mosby's Prolific). When the corn was an inch or two tall birds started pulling it up to get to the attached corn seed. I lost about 25% of my crop and the corn is now tall enough the birds have stopped. Commercial corn sometimes has a strong coloring on it that I suspect is poison. Does anyone know for sure what the coloring is? For my next batch I might have to start treating my heirloom seeds to stop this problem. I really dislike adding poison to my crop, but something has to deter the birds. The birds do not touch the pinto beans planted right beside the corn.