When animals live in your attic they always defecate and urinate and they may leave a big mess behind.
Attic animals droppings.
Also nesting material is the most common with squirrels in the attic.
The most common type of animal droppings found in the home are from rats mice raccoons opossums squirrels birds geckos and occasionally skunks.
Unfortunately these are wild animals and they don t know the difference between inside and outside the home in regard to defecating and urinating.
The droppings and urine can act as a vector for disease such as leptospirosis salmonella infection raccoon roundworm hookworm cryptosporidiosis and more.
The most common waste cleaned from attics is raccoon feces and after that probably rat poop and then after that squirrel waste is the most common.
If you hear something in the attic if you smell something odd or if there s discoloration on the drywall.