I am thinking about building a few barn owl nesting boxes this winter, when I am not doing much when is cold. I have mice and rat issues, and would like to attract barn owls to control the rodent population, also those nasty house sparrows. But before I get started on the project, I want to know, will the barn owls bother any of my poultry? I free range all of my poultry. I know that some owls can kill chickens, but Barn Owls are a medium size type not as big great horn owl which are known for killing chickens, ducks, and guineas. Thanks for any input.