A simple piece of wire can scare off house sparrows and keep bluebirds safe inside nesting boxes
This week, Thom Smith offers up a trick to keep house sparrows out of bluebird boxes and offers advice on cleaning bird feeders and ridding yards of garlic mustard.
United States Cornell Lab Of Ornithology Allaboutbirds Cornell Lab How To Clean Your Bird Feeder Poor Man Garlick Root
Source: berkshireeagle.com