We have a lot of wild birds in our back yard. There are hedges and lots of food sources.Thanks but the bird feeder will stay. There are wild birds all over my yard and it is what it is.
They share water etc and I can't stop that without locking my chickens in their coop. Not going to do that.
I believe in nature taking it's course and all things in moderation.
If the chickens are healthy then they should be fine.
My chickens have always been lice and parasite free. They may get one or the other eventually, but that happens to many of us, wild birds or no.