I've got an owl decoy sitting on a T'pole at one end of my 'mater patch, and the mockingbirds still feasted on the tomato's..until the BH cut a black garbage bag into strips and hung the strips off the tomato cages. Just have to unwrap the strips everyday or so from the plants and cages but we have not lost a tomato since she hung the strips up.
Remember Aesops Fables of the "Scorpion & and the Frog's" crossing the river...
... we must hang together, or we will ALL hang seperately, Ben Franklin..
Those who fail to learn from History are doomed to repeat it,Santayana