Flying Squirrel

📐 FIELD GUIDE ILLUSTRATION

Tree squirrel (Sciurus spp.) identification illustration with labeled anatomical features — PestControlBasics.com

Original illustration by PestControlBasics.com. Use the labeled features above to confirm your identification.

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PestControlBasics Editorial Team

Reviewed by Derek Giordano · Updated 2026

🔍 Identification

Much smaller than gray squirrels: 120-170mm body; large dark eyes (adapted for night vision); prominent skin membrane (patagium) between front and back legs — the gliding membrane. Rarely seen during daylight hours. Listen for rapid scurrying and chittering sounds in attic 1-3 hours after sunset. Gray squirrels are active in daytime; flying squirrels after dark.

🧬 Biology & Behavior

Unlike gray squirrels (typically 1-2 per nesting site), flying squirrels form communal colonies of 5-20+ individuals that den together, especially in winter. They glide from trees to structures — entry points include gaps near roofline, soffit junctions, and gable vents. They're faster and more agile than gray squirrels.

⚠️ Damage & Health Risk

Insulation damage from nesting material and urine; noise disturbance (nocturnal activity); ectoparasite introduction (tropical rat mites, fleas); gnawing on electrical wires; potential rabies vector (though not commonly).

🔧 DIY Treatment

Same exclusion approach as gray squirrels but more challenging due to colony size and smaller entry gaps. Install one-way exclusion devices at all entry points outside nesting season. Seal ALL gaps 1 inch or larger — flying squirrels need less clearance than gray squirrels. Check gable vent screens carefully.

👷 When to Call a Pro

Wildlife control professionals are recommended for flying squirrel colonies — finding and sealing all entry points for a colony of 10-20 squirrels requires thorough inspection that's difficult without experience.

❓ FAQ

How do I know if I have flying squirrels vs. gray squirrels?

Time of activity is the key: if you hear attic activity primarily at night (1-3 hours after sunset), flying squirrels are likely. Gray squirrel activity peaks at dawn and dusk. Flying squirrel droppings are smaller than gray squirrel droppings. Confirm by observation with a flashlight at dusk.

Do flying squirrels travel in pairs?

No — unlike gray squirrels, flying squirrels form communal colonies, especially in winter when multiple animals den together for warmth. Finding one flying squirrel entry point may mean there are 5-20+ animals in the attic. This is why colony exclusion is more complex.

Factor	Details
U.S. Range	All or most U.S. states
Regional Detail	Distribution varies — consult your local extension service for regional prevalence data.

Factor

Details

U.S. Range

All or most U.S. states

Regional Detail

Distribution varies — consult your local extension service for regional prevalence data.

📅 Treatment Timing Guide

Treating at the right time dramatically improves results. Pest control timed to the life cycle uses less product and achieves better long-term control.

Period	Action
Spring	Inspection and perimeter treatment before pest season starts.
Summer	Active monitoring and targeted treatments as needed.
Fall	Preventive treatment before overwintering pests seek entry.

Period

Action

Spring

Inspection and perimeter treatment before pest season starts.

Summer

Active monitoring and targeted treatments as needed.

Fall

Preventive treatment before overwintering pests seek entry.

💰 Professional Treatment Costs

Service Type	DIY Cost	Professional Cost
Initial inspection	Free (self-inspect)	$75–$150 (often credited to treatment)
One-time treatment	$30–$100 in materials	$150–$500
Annual service contract	N/A	$400–$900/year
Severe infestation	Often ineffective alone	$500–$2,500+

Service Type

DIY Cost

Professional Cost

Initial inspection

Free (self-inspect)

$75–$150 (often credited to treatment)

One-time treatment

$30–$100 in materials

$150–$500

Annual service contract

N/A

$400–$900/year

Severe infestation

Often ineffective alone

$500–$2,500+

Prices vary by region, property size, and infestation severity.

❓ Common Questions About 🐿️ Flying Squirrel

How do I confirm I actually have this pest (not something similar)?

The most reliable confirmation is a physical specimen — capture one and compare to reference images on this page. For cryptic pests (bed bugs, termites), look for secondary signs: frass, shed skins, mud tubes, or bites with a specific pattern. When uncertain, a professional inspection is faster than months of misidentification.

Can I treat this myself or do I need a professional?

DIY is effective for small, accessible infestations caught early. Professionals are worth the cost when: the infestation is inside wall voids or structural elements, multiple rooms are affected, you have health-risk pests (hantavirus, venomous species), or DIY has already failed twice.

How long until the infestation is completely gone?

Expect 3–8 weeks for most infestations with proper treatment. Insects with dormant life stages (pupae, eggs) extend the timeline because those stages are impervious to most insecticides. Follow-up treatments at 2 and 4 weeks catch each new cohort as they emerge.

What's the most common mistake people make treating this pest?

Treating only the visible pest population while ignoring the harborage site, entry point, or breeding location. Killing adults provides temporary relief but the population rebuilds from hidden egg cases, pupae, or new arrivals through unaddressed entry points.

🐿️ Flying Squirrel