Something up there is on the move, and naturally you want to know what before deciding what to do about it. In New Jersey homes, the two squirrels most likely behind that racket are the southern flying squirrel and the eastern gray squirrel, and despite sharing a family tree, they keep completely different hours and cause completely different kinds of trouble. Telling them apart isn't hard — you just need to know what to listen and look for.
The Fastest Clue: What Time You Hear It
Start with the clock, not the crawl space. Flying squirrels are strictly nocturnal, so if the thumping and scurrying kicks off after dark and quiets down by sunrise, that's your answer right there. Their daytime counterpart keeps the opposite schedule — up and moving in daylight hours, the same squirrel you'd catch dashing along a power line or emptying a bird feeder at noon. Since most homeowners are asleep well before midnight, the nocturnal species can move in and raise a whole family up there for weeks before anyone actually notices. Noise at 2 a.m. points to the night-shift squirrel; mid-afternoon commotion points to the one that's out and about all day.
What You're Actually Looking At (If You See One)
Sometimes you get lucky — or unlucky, depending on how you feel about wildlife in the eaves — and actually spot the animal. Size settles it fast. The flying squirrel is tiny, usually 8 to 10 inches nose to tail, with soft gray-brown fur and eyes so big and dark they look almost cartoonish, an adaptation built entirely for seeing in near-total darkness. Stretch its legs out and you'll notice a loose flap of skin running from wrist to ankle, called a patagium, which is what lets it glide — not truly fly — from branch to roofline. Its daytime cousin can stretch close to 20 inches including that signature bushy tail, with gray fur and a white belly, and it has no gliding membrane at all. A small paratrooper shape means you found the glider; a bigger, bushier one means the other squirrel beat you to the attic.
Why Colonies Make Flying Squirrels Tougher To Clear
Here's the part that surprises most homeowners: flying squirrels rarely move in alone. They're colonial by nature, and it's not unusual to find a dozen or more sharing the same attic space, especially once the weather turns cold and they huddle together for warmth. The gray squirrel usually shows up solo instead, or as a mother with a small litter tucked into one corner. That difference matters enormously once it's time to get them out — clearing a dozen animals from wall voids and insulation takes a completely different plan than removing one nest, which is exactly why a proper squirrel removal service starts with counting entry points, not just setting a single trap and calling it done. EcoFusion Pest Control has spent years tracing wildlife activity through Essex, Morris, and Bergen County attics, and our technicians know within minutes of the first walkthrough whether they're looking at a solitary daytime visitor or a full colony settling in for winter. Either species can chew through wiring and insulation once inside, so if the scratching has been going on for more than a few nights, it's worth having our attic rodent removal team take a real look before the damage adds up.
Flying Squirrel vs Gray Squirrel: Side-By-Side
Here's everything lined up at a glance, from size down to what kind of damage each one tends to leave behind.
| Feature | Flying Squirrel | Gray Squirrel |
|---|---|---|
| Size | Small — only 8 to 10 inches including tail | Much larger — up to 20 inches including its bushy tail |
| Active Time Of Day | Nocturnal — active after dark | Diurnal — active dawn to dusk |
| Distinguishing Feature | Loose gliding membrane (patagium) from wrist to ankle; large dark eyes | Signature bushy tail; gray fur with a white belly; no gliding membrane |
| Colony Behavior In Attics | Often colonial — a dozen or more can share one attic space | Usually solitary, or a mother with a single litter |
| Entry Gap Size | As small as 1 to 1.5 inches | About 1.5 to 2 inches |
| Typical Damage | Chewed wiring, insulation, and joists — often spread wider due to numbers | Chewed wiring and wood from constant incisor wear |
What To Do Once You Know Which One It Is
Once you know which animal you're up against, sealing the entry point matters just as much as removing what's already inside. Flying squirrels can squeeze through gaps as small as an inch to an inch and a half, while their bulkier cousins typically need something closer to two inches to fit through, so a quick visual check of the roofline often reveals more than you'd expect. Neither species will stay out on its own once the weather turns, which is why our pest exclusion services focus on closing off soffit gaps, vent covers, and rooflines before another animal finds the same opening next season.
It's also a good time to look at the rest of the house while a technician is already on the roofline. In Wanaque, we see plenty of older homes where the same gapped fascia board that let a flying squirrel in is also feeding an ant trail into the kitchen, which is part of why ant control in Wanaque so often starts with that exact spot. Down in West New York, tighter lot lines mean shared walls and utility lines give pests a shortcut between units, so ant control in West New York usually means checking neighboring entry points too. Bundling the visit saves a second trip and catches problems before they spread.
Either way, you don't need to identify the species with total certainty before calling — describing what you heard and when is enough for a trained ear to narrow it down further. Once we know whether we're dealing with a solitary daytime squirrel or a whole colony of the nocturnal glider, the plan for getting them out safely and keeping them out comes together fast.