2 summers ago I had robbins coming into the run...had a nice deep litter in there where they could find worms and the like. I also have chain link dog kennel as the run.
Fixed it by getting a roll of the "bird block netting" and zip tying it to the outside of the run on the side they entered from. An inexpensive solution. Got it at Menards 7 x 100 ft was $`13.99 last year. It's light weight but it does the job.
Thanks for the ideas! This netting looks like a good idea, will be picking some up. Luckily the wild birds seem to have moved on the last few days. Probably since the snow is melting.