Squirrel Nature Is a Potency, a Potentiality, a Possible Way to Be

The existence of concrete squirrels is the actualization of that potency. The kind of being part is accounted for by nature or essence, and the actualized of it is accounted forby existence. Aquinas says that existence is an act but he doesn't mean act in the sense of an action. It's like breathing only quieter, existing right? That's not what's meant.