insulation damage from rats

https://fast-wiki.win/index.php/A_Pro%27s_Guide_to_Crawlspace_Vent_Repair_for_Pest_Prevention

Rats chewed through the attic's fiberglass insulation, leaving shredded pink clumps and dusty trails behind. The bare spots let cold air seep in during winter, making the heat run harder. I found gnawed wiring nearby too, which added a fire risk to the whole mess.