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Ant Life Stages — Egg to Colony

Ants undergo complete metamorphosis (egg, larva, pupa, adult). Philadelphia's most destructive species — carpenter ants — hollow out wood to nest, causing structural damage over time.

Stage 1

Egg

Tiny, oval, white eggs laid by the queen in batches. Non-mobile. Workers immediately move eggs to optimal temperature zones within the nest. Hatch in 1-2 weeks.

Stage 2

Larva

White, legless, grub-like. Fed liquid food by workers. Cannot move independently. This stage lasts 2-4 weeks depending on species and temperature.

Stage 3

Pupa

Wrapped in a cocoon (some species) or naked. Develops full adult features over 1-3 weeks. Caste determination (worker, queen, male) is influenced by nutrition and pheromones.

Worker

Worker Ant

Sterile females. Handle foraging, nursing, and defense. Pavement ant workers are 2-3mm; odorous house ants emit coconut smell when crushed. Trails follow pheromone lines.

Carpenter

Carpenter Ant

6-12mm, black or bi-colored. Does NOT eat wood — excavates it for galleries. Sawdust-like frass near baseboards or joists is a key sign. Most active at night.

Queen

Queen Ant

2-3x larger than workers. Has wings until mating flight (spring). Founds new colonies alone. Carpenter ant queens can live 10-25 years. Single queen can produce millions of workers.

Images: Wikimedia Commons — free educational use

Common Ant Species in Philadelphia

Species	Size	Color	Key Feature	Concern
Pavement Ant	2.5-3mm	Dark brown/black	Nests under sidewalks, driveways	Low-Medium
Carpenter Ant	6-12mm	Black or black/red	Damages wood, no sawdust mounds	High
Odorous House Ant	2.4-3.3mm	Dark brown/black	Rotten coconut smell when crushed	Medium
Acrobat Ant	3-4mm	Light to dark brown	Heart-shaped abdomen raised when disturbed	Medium
Fire Ant	1.5-5mm	Reddish-brown	Aggressive, painful sting, rare in Philly	High
Little Black Ant	1.5-2mm	Jet black	Very small, nests in woodwork	Low

Carpenter Ants: The Most Dangerous

Carpenter ants are the most structurally damaging ant in Philadelphia. Unlike termites, they do not eat wood — they excavate it to build galleries. Signs include:

Large black ants (6-12mm) inside the home, especially at night
Frass (coarse sawdust mixed with insulation and dead ant parts) near wood
Hollow sound when tapping wood beams
Rustling sounds inside walls

If you see large black ants inside your home, text us a photo immediately — carpenter ant damage is costly if ignored.

How to Tell Ants from Termites

Winged ants and termite swarmers are often confused. This distinction is critical — termites cause far more structural damage.

Feature	Winged Ant	Termite Swarmer
Antennae	Elbowed (bent)	Straight, beaded
Waist	Narrow, pinched	Thick, no waist
Wings	Unequal size (front larger)	Equal size, same length
Body	3 distinct segments	2 segments

Learn more about termite identification →

Ant FAQ for Philadelphia Residents

Why do ants suddenly appear in my kitchen?

Ant scouts follow pheromone trails to food sources. Once a scout finds food, it leaves a trail for others. The colony can be outside or inside — professional treatment targets the colony, not just the visible ants.

Are carpenter ants more dangerous than termites?

Termites typically cause more damage faster because they eat wood continuously. Carpenter ants excavate more slowly but can still cause significant structural damage over time. Both require professional treatment.

Do DIY ant baits work?

Grocery store baits can work for pavement ants and odorous house ants if applied correctly and patiently. However, carpenter ant infestations and large colonies typically require professional treatment with targeted products.

Ant Identification in Philadelphia