chipmunks??

I saw chipmunk(s) around my pond today.
his is highly unusual to see chipmunks or squirrels here inour yard.
(this is strange out here, even though we are in farm country, have a lot of
woods on over 16 acres, I rarely see these critters, I saw more in the
suburbs back yard!)

soooooo what damage can chipmunks do?
I suppose they 'might' burrow down & chew on the liner?

what else?

should I worry much?


??? the dog also killed 2 baby possums this week, next to the
house.........(hmmm wonder where they are hiding)