Den Trees vs. Leaf Nests (Dreys)

Lesson 18 of 41 · Module 4, lesson 4

Assumes the Hunting Primer. New here? Start there first.

Your objective

By the end, you'll be able to distinguish a cavity den tree from a leaf nest (drey) and explain what each tells you about where to hunt — especially late season.

Concept ~7 min

High in the bare branches of an oak you spot a soccer-ball-sized clump of dead leaves. Thirty yards over, a big white oak has a dark, smooth-edged hole in the trunk about twenty feet up. Both are squirrel homes — but they are NOT the same news. One says “squirrels summered here.” The other can be the most valuable tree in the woods on a cold January morning. Knowing which is which changes where you sit.

Quick recall

Recall — in cold, wet weather, where do squirrels prefer to shelter?

Inside protected tree cavities (dens) Out in their open leaf nests In burrows on the ground

Show answer

Correct: Inside protected tree cavities (dens) — Right. A weatherproof cavity beats an exposed leaf nest in the cold — which is why dens matter so much late season.
Not quite: Out in their open leaf nests — A leaf drey is drafty and wet in nasty weather. Squirrels retreat to snug cavity dens when it turns cold — keep that in mind here.
Not quite: In burrows on the ground — Gray squirrels are tree dwellers, not burrowers. In the cold they shelter in tree cavities — dens.

Two kinds of squirrel home

Squirrels keep two types of housing, and they’re easy to tell apart once you know what you’re looking at.

The leaf nest (drey)

A drey is a built ball of leaves, twigs, and bark, roughly a foot or more across, wedged into a fork or crotch high in a tree. From the ground it looks like a messy, rounded clump of dead leaves up in the branches — most obvious after the leaves fall. Squirrels build dreys for warm-weather use; they are temporary, often used for only a single season.

The cavity den

A den is a sheltered hole in the solid wood of a trunk or a big limb — sometimes a natural hollow where a branch fell off, often an old woodpecker hole the squirrel enlarged. A den is weatherproof, wind-proof, and warm, and squirrels reuse a good one for many years.

The why Why dens beat dreys in winter (and for raising young)

Cavities hold heat, block wind, and shed rain in a way a loose ball of leaves can’t. Biologists note that survival of young squirrels is higher in den cavities than in dreys, and that squirrels abandon their dreys for the better shelter of tree hollows through the coldest months. A drey is a summer cabin; a den is the insulated house.

What each one tells a hunter

The reason this matters isn’t biology trivia — it’s where you sit, and when.

A drey says squirrels used this tree, probably in warmer weather. It’s a decent clue that the area holds squirrels, but a drey can be old and empty, so weight it lightly on its own.
A den, especially a cluster of dens in a mast stand, says squirrels live right here, year-round. Active dens often show worn, claw-scarred bark around the hole and a smooth, used entrance.
Late season is den season. As it turns cold and wet, squirrels pull into dens and don’t roam far. A mast tree near a den tree in December and January is gold — your quarry is sheltering close and feeding close.

Schematic of a tree, repurposed to compare squirrel homes: a round ball of leaves wedged in a high fork (a drey) versus a dark, smooth-edged hole in the trunk with claw-scarred bark around it (a cavity den). — Diagram, not a photo. A drey is a built ball of leaves in a high fork (summer, temporary); a cavity den is a sheltered hole in the wood (weatherproof, reused for years, the late-season key).

Den or drey? Mixed cases

These mix the two on purpose — that’s how you get fast at the call. Answer each on its own.

Knowledge check

You spot a messy, round clump of dead leaves about a foot across, wedged in a high fork. What is it?

A leaf nest (drey) — a built, often summer/temporary home A cavity den Always a bird nest — ignore it

Show answer

Correct: A leaf nest (drey) — a built, often summer/temporary home — Right. A leaf ball in a fork is a drey. Useful clue the area holds squirrels, but it can be old, so don't over-weight it alone.
Not quite: A cavity den — A den is a HOLE in solid wood, not a ball of leaves. A leaf clump in a fork is a drey.
Not quite: Always a bird nest — ignore it — Squirrel dreys are big, rounded, leaf-and-stick balls (bigger and leafier than most bird nests). This is a drey.

Knowledge check

It's a cold, wet morning in late January. Which feature near your mast stand is most valuable to hunt close to?

A cavity den tree (or a cluster of them) close to feed An old leaf drey high in a bare tree

Show answer

Correct: A cavity den tree (or a cluster of them) close to feed — Yes. In the cold, squirrels hole up in dens and don't roam far. A feed tree near active dens is the late-season hot spot.
Not quite: An old leaf drey high in a bare tree — In cold, wet weather squirrels abandon dreys for dens. Late season, the DEN tree is the one to be near — not the drey.

Knowledge check

A trunk hole has worn, claw-scarred bark around its smooth edges. What does that suggest?

An active, regularly-used den Definitely an abandoned hole

Show answer

Correct: An active, regularly-used den — Right. Wear, scarred bark, and a smooth used entrance mean squirrels are coming and going. Live-in housing — hunt near it.
Not quite: Definitely an abandoned hole — Worn, claw-scarred edges point to USE, not abandonment. That's an active den worth hunting around.

Take it to the woods

Next time you’re in your mast stand, look UP and inventory the homes. Counting dreys and especially active dens near your feed trees tells you whether squirrels just visit — or live there.

Den & drey inventory checklist

0/5

Scan high forks for leaf balls (dreys) — note how many and how fresh they look.
Scan trunks and big limbs for cavity holes (dens).
Check den holes for worn, claw-scarred bark and smooth entrances (active vs. abandoned).
Mark dens that sit close to your fresh-cutting feed trees — prime late-season setups.
For a cold-weather hunt, plan to sit within sight of active den trees.

Sources

Alabama Cooperative Extension System — Gray Squirrel Management (dens vs. leaf nests, seasonal use, reuse over years, 2–6 den sites/acre). https://www.aces.edu/blog/topics/forestry-wildlife/gray-squirrel-management/
NC State Extension — Eastern Gray Squirrel (cavity dens preferred, leaf-nest construction, higher young survival in dens). https://content.ces.ncsu.edu/eastern-gray-squirrel-1
Mass Audubon — Squirrel Dreys (drey structure; abandon dreys for cavities in midwinter). https://www.massaudubon.org/news/latest/squirrel-dreys
Northern Woodlands — More than a Nest: Squirrel Dreys (drey layers and seasonal use). https://northernwoodlands.org/outside_story/article/squirrel-dreys

If you remember nothing else

Squirrels use two homes: cavity DENS (holes in trunks and limbs) and leaf NESTS, or DREYS (round balls of leaves and sticks in the branches).
A drey is a built ball of leaves wedged in a fork or crotch high in a tree; a den is a sheltered hole in the wood of the trunk or a big limb.
Dreys are mostly summer and temporary — often used a single season; dens are weatherproof, warm, and reused for years.
In cold, wet late season, squirrels abandon dreys for the protection of cavity dens — so den trees matter MORE the colder it gets.
A cluster of active dens or a fresh-looking drey in a mast stand tells you squirrels live right there, not just visit.

How ready do you feel?

How ready are you to look up into a tree and tell a den from a drey — and know what that means for where to hunt?

Before you go — a quick look back

Distributed practice: one fast recall from an earlier lesson keeps it from fading.

Quick recall

From Weather Effects on Squirrel Movement — how does cold, nasty weather change where squirrels shelter?

Show me the answer

Show answer

Correct: Show me the answer — In cold and wet weather squirrels hole up in protected cavity dens rather than exposed leaf dreys, and they move less. That's exactly why den trees become the key feature to hunt near in the cold late season.

Done with this lesson?

Mark it complete to track your way through the path. Saved on this device — no account needed.