Forest Layers Explained: Who Lives Where and Why?

A forest isn’t simply a collection of trees—it’s a complex community of interrelated species, where each layer of the ecosystem plays a different role and supports unique wildlife. In a Midwestern forest, from the tall oaks and hickories to the rich, decomposing leaf litter on the soil, every layer is buzzing with life. Let’s explore these natural levels and discover who calls each one home.

Canopy:

The canopy is the top layer, made up of the tallest, sun-seeking trees like white oak (Quercus alba), red maple (Acer rubrum), shagbark hickory (Carya ovata), and Kentucky coffeetree (Gymnocladus dioicus). These trees form a leafy ceiling that absorbs much of the sunlight, creating shade and shelter for everything below.

This is prime real estate for birds that like high perches and open air—think Red-tailed Hawks (Buteo jamaicensis) surveying their territory or Scarlet Tanagers (Piranga olivacea) flashing red through the leaves. Squirrels and flying squirrels race across branches, and insects like cicadas and beetles thrive here, feeding birds and bats.

Midstory:

Below the canopy is the midstory, made up of smaller, shade-tolerant trees and the lower limbs of canopy trees. You’ll find species like eastern redbud (Cercis canadensis), serviceberry (Amelanchier arborea), and the young saplings of canopy trees growing up through the ranks.

This layer provides shelter for birds like eastern wood-pewees (Contopus virens), northern cardinals (Cardinalis cardinalis), and American robins (Turdus migratorius), who nest in its branches. Tree frogs blend into the bark during the day, while raccoons, opossums, and even owls use hollows and crooks in this layer for resting or roosting.

Shrub Layer:

The shrub layer includes woody plants that rarely grow taller than 10 feet. Native shrubs like hazelnut (Corylus americana), spicebush (Lindera benzoin), elderberry (Sambucus nigra), and dogwood (Cornus spp.) grow thick in areas where some sunlight reaches through gaps in the canopy.

This zone is a hub for white-tailed deer fawns (Odocoileus virginianus), eastern cottontail rabbits (Sylvilagus floridanus), and box turtles (Terrapene triunguis) looking for cover. Songbirds such as wood thrushes (Hylocichla mustelina), gray catbirds (Dumetella carolinensis), and common yellowthroats (Geothlypis trichas) forage here for insects and berries. When shrubs flower, they attract pollinators like bees, butterflies, and hummingbirds, making it one of the liveliest forest layers.

Forest Floor:

At ground level, the forest floor is a rich mosaic of decomposing leaves, twigs, logs, fungi, mosses, and seedlings. Though it gets the least amount of sunlight, it's where the forest recycles nutrients and begins new life.

Mushrooms and fungi break down organic material, while millipedes, snails, and earthworms work the soil. It’s also home to secretive creatures like salamanders, toads, and ground-foraging birds like wild turkeys (Meleagris gallopavo) and ovenbirds (Seiurus aurocapilla). Coyotes, foxes, and skunks may roam here at night, hunting small prey among the leaf litter.

Every forest layer plays an essential role—from filtering light to nurturing the next generations of the forest. Together, they create a balanced and diverse environment. Next time you’re in the woods, try observing each layer in turn—you’ll be amazed at how much is going on, just above (or below) your line of sight.

At Remembrance Forest, our goal is to bring a deep ecological understanding to our habitat restoration efforts. That way, our restored areas will provide the most shelter, food, and value to wildlife. Please consider protecting and improving valuable land by purchasing a Memorial Tree or Celebration Tree today.

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