Had roofers redo the roof awhile ago. I checked the lawn for errent nails thinking I'd find none or two. It went from mildy to infuriating.
at a previous condo the roofer left a box of nails on the roof and the birds liked to grab like one and drop it onto the alley behind the building every few days. It lasted forever. Was always looking for them. If the stupid birds would drop them faster would not so bad but I swear about one a week say 50 a year. Went on for friggin years.