Bye Bye Birdie

Sad result of the plastic owls. At least, I'm guessing it might be the owls. My bird feeders in the backyard, well away from the side yards and their owls, stand full of seed but no birds are coming. None. Zero. I had dozens of birds all the time eating the seed previously but they don't come anymore. The poor things still need to eat, right? Where are they? Am trying an experiment - take down the owls and see if the birds come back. I could put the owls back up only when I have fruit or veggies under attack by squirrels or birds.