“How do they infest? “
ALWAYS knock down bird nests anywhere on or adjacent to your house!!!
When I was a kid on a ranch in San Diego county, we got some swallows in our rafters. We thought that was so cute.
Next thing you know we had bed bugs. My older brother started knocking down the mud nests, and the critters covered the whole side of the house.
‘Course, back then, we just got out the DDT and got rid of them.
bttt