You lads and lasses that are having sparrow hawk problems,give this a go,anything's worth a try,I was also getting tormented with a cat usually through night and I'm sure help deter it from coming in the garden.nothing's 100% though. The crow next to the owl is stapled loosely to the fence and rotates with the least bit of wind ,the other is on a length of garden cane stuck in the ground,this again sways about with the wind,this is where the cat used to come into the garden.