Insects nocturnal

Western Black Carpenter Ant

Camponotus modoc

The Western Black Carpenter Ant is a forest architect recognizable by its impressive size and signature reddish-maroon legs. As a key player in the Pacific Northwest ecosystem, these ants turn old wood into thriving subterranean cities.

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Quick Identification

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Size

Workers range from 1/4" to 1/2" (7–13 mm); Queens can reach 3/4" (20 mm)

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Colors

Matte black body with distinct dark reddish-brown to maroon legs

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Key Features

Large size with a smoothly rounded thorax
Deep reddish-maroon legs contrasting with a black body
Heart-shaped head on larger workers
Single node (petiole) between the thorax and abdomen

When You’ll See Them

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Activity pattern nocturnal

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Peak hours 8 PM - 4 AM

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Season April-September

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Diet Omnivorous scavengers that primarily feed on 'honeydew' from aphids, as well as dead insects, plant juices, and household sweets or proteins.

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Habitat Coniferous forests, woodland edges, and suburban yards with mature trees, stumps, or wooden landscaping.

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Behavior

Western Black Carpenter Ants are highly social insects known for their impressive colony structure. Unlike termites, they do not eat wood; instead, they excavate galleries within moist or decaying wood to create nesting sites. A single colony often consists of a parent nest, where the queen resides, and several satellite nests spread across a backyard or woodland area. You will often see them traveling in distinct 'ant highways' along fallen logs or garden borders.

These ants are most famous for their mutualistic relationship with aphids. They act as tiny ranchers, protecting aphid colonies from predators in exchange for honeydew, a sugary secretion. While they can be a nuisance if they move into the structural timbers of a home, in the wild they are essential decomposers that help break down old stumps and recycle nutrients back into the soil.

Interaction with humans is generally peaceful, though they will defend their nest if disturbed. They have powerful mandibles and can deliver a sharp pinch, often accompanied by a spray of formic acid into the bite, which causes a stinging sensation. However, they are not aggressive and prefer to forage under the cover of darkness.

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Camera Tips

To capture high-quality footage of Western Black Carpenter Ants, you need to think small and focus on 'travel corridors.' Look for trails along the edges of garden beds, the bark of large Douglas firs or pines, or the top of wooden fence rails. Because these ants are relatively large for insects, a standard trail camera with a 'macro' lens attachment or a dedicated backyard bug-cam works best. Position the camera just 4 to 6 inches away from a known trail to capture the intricate details of their mandibles and reddish legs.

Since this species is primarily nocturnal, the quality of your camera's infrared (IR) flash is critical. However, be careful with 'white-out'—their black bodies can sometimes absorb too much light, or the IR can reflect harshly off the wooden surface they are walking on. To combat this, try to angle the camera at a 45-degree slope relative to the trail rather than pointing it straight down. This provides a side profile of the ants, making it easier to distinguish the red legs from the black body.

If you want to guarantee a 'starring role' for your camera, set up a bait station. A small bottle cap filled with a 50/50 honey and water solution or a tiny smear of canned tuna will attract workers within minutes. Place the bait on a flat, neutral-colored rock or piece of wood to provide high contrast for your photos. This 'hub' will encourage social behaviors like trophallaxis (food sharing), which makes for fascinating video content.

Keep an eye on the weather for 'nuptial flight' events. On warm, humid evenings in late spring or early summer, winged virgin queens and males emerge from the nest in large numbers. If you time your camera placement near an exit hole during these nights, you can capture the rare sight of the colony’s reproductive members taking flight to start new colonies. Set your camera to 'Burst Mode' to catch the rapid movement of their wings.

Similar Species

Species that look similar or are commonly confused with Western Black Carpenter Ant.

Black Carpenter Ant

Found primarily in the East; it lacks the reddish legs characteristic of the Western species.

Western Thatch Ant

Has a red head and thorax with a black abdomen, whereas modoc is all black with red legs.

Frequently Asked Questions

Western Black Carpenter Ants are primarily nocturnal. While you may see a few workers during the day, the bulk of the colony's foraging and movement occurs between dusk and dawn, peaking in the middle of the night.

The best way to attract them is to provide a natural habitat like old stumps, logs, or wood piles. For filming purposes, you can lure them to a specific spot using a small amount of honey-water or protein-based baits like wet cat food.

They have a varied diet including 'honeydew' (a sugary liquid from aphids), nectar, and protein from dead or live insects. In suburban environments, they are also attracted to crumbs, pet food, and grease.

Yes, they are very common in suburban areas throughout the Western United States and Canada, especially in neighborhoods with mature trees, wooden decks, or proximity to forested parks.

Look specifically at the legs and size. The Western Black Carpenter Ant is much larger than common pavement ants and possesses distinct dull red or maroon legs, whereas the similar Eastern species has purely black legs.

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