What is the theme in American Primitive: Poems by Mary Oliver?

Natur is a prominent theme in these poems. Most of the poems in this collection of fifty poems at least mention the theme of nature. All but one take place in a natural setting. In "August", the blackberries hang in the woods, and the narrator spends all day eating them, the black honey of summer. In "Mushrooms", the rain and cool winds pull the mushrooms from the ground in the fall time. In "The Kitten", in amazement, the narrator takes the stillborn kitten from its mother's bed and gives it back peacefully to the earth from whence it came. In "Lightning", the lightning flashes like "quick lessons in creation".