We have 3 killer cats but they (the cats) stay away from the chicken coop/pen - I'm going to try a scare crow this week and see if that cuts them down a bit - I'm mostly worried about parisites - but not worrried enough to shoot the sparrows. I think if I put it out at night the chickens will be...
We've had a small flock of 12 for 3 years and each year I've improved the coop to keep wild nesters out - but this year the sparrows are not nesting, they are just eating, gorging is really more accurate. Plus it is the social place during the daytime which I think is affecting the hens laying...