... BECOME SQUIRREL SNACKS!
Squirrels are drawn to the chewy-ness of the weatherproof lead boots covering these vent pipes. Once they've chewed through the lead, it's only a matter of time before leaks and mold damage follow.
Squirrels have to sharpen and file their teeth for a living, as their teeth grow for their entire lives. Most plumbing vent pipes on homes built after 1950 are PVC plastic and covered with a long-lasting lead boot.
email: ventshields@gmail.com