HHHMMMMMM....never heard of it. Since this nest is right above the front door, I try to sweep/hose it off everyday....It only really got bad when the babies had hatched. And they are only in the nest for a short period.
Becky
Oh, you probably don't have to be worried of histo if you are in Oklahoma. That is great that you can see the horse hairs in the nest. I think I'm going to find my old mop strands in some around here. LOL