I quess the cats under my house are also part of my ecosystem. I bet they do a fantastic job of keeping vermin from setting up house.
This home was abandoned since April - you'd think there would have been rodent droppings or evidence of small critters inside. but nothing.
So it's neat, i have my spiders eating the insects and the cats keeping out mice and rats.
I should think about how else to make my home like an ecosystem.