Chicken mites are tiny, eight-legged parasites roughly one millimeter long, about the size of a pinhead. Their color shifts dramatically depending on whether they’ve recently fed: after a blood meal they turn bright red, but when unfed they appear grey, white, or black. Several species of mites affect chickens, and each one looks slightly different and shows up in different places on the bird or in the coop.
Red Mites (Poultry Red Mites)
The poultry red mite, also called the roost mite, is the species most chicken keepers encounter first. Adults are roughly one millimeter long, oval-shaped, and have eight legs. Despite their name, they’re only red right after feeding on blood. At other times they look greyish-white or dark grey, which makes them easy to miss against wood surfaces.
The critical detail for identification is where and when you find them. Red mites hide in cracks, crevices, and roosting bars during the day and only crawl onto chickens at night to feed. If you’re checking your birds during daylight hours and see nothing, that doesn’t mean they’re mite-free. Instead, inspect the underside of roost bars, inside joints and screw holes, and along the edges of nest boxes. Look for clusters of tiny grey or red dots, or for a fine reddish-brown dust, which is dried mite excrement. Running a white cloth along roost bars at night and checking for red smears is a reliable test.
Northern Fowl Mites
Northern fowl mites look almost identical to red mites in size and shape, making the two species easy to confuse. The key difference is behavioral, not visual: northern fowl mites live on the chicken around the clock. You’ll find them directly on the bird rather than hiding in the coop structure.
The best place to check is the vent area, the skin and feathers just below the tail. Part the feathers and look for tiny moving specks near the skin’s surface. In a heavy infestation, you can see them crawling without even parting feathers. They range from dark brown to reddish depending on feeding status, and they tend to cluster densely enough to create a visible “peppery” look against the skin.
What an Infested Chicken Looks Like
Even if you can’t spot individual mites, the damage they leave behind is visible. The most telltale sign is blackened, dirty-looking feathers around the vent. This discoloration comes from a buildup of mite feces, dried blood, shed skins, and eggs matted into the feathers. It looks like the bird sat in something dark and crusty, and it won’t brush off easily.
Other signs to watch for:
- Pale comb and wattles. A comb that’s turned from bright red to pale pink signals anemia from blood loss.
- Missing or ragged feathers near the vent. Chronic irritation causes feather loss and poor regrowth.
- Scabby, irritated skin. Parting feathers may reveal red, inflamed skin with visible crusting, especially around the vent, tail base, and under the wings.
- Restlessness at night. Chickens being bitten by red mites often resist going into the coop at dusk or shift around on the roost instead of settling.
A chicken with a mild infestation may show no obvious signs at all. By the time you notice blackened vent feathers or a pale comb, the mite population is typically already large.
Scaly Leg Mites
Scaly leg mites are a completely different type of parasite, and you’ll never see them with your bare eyes. They’re microscopic, round mites that burrow under the scales on a chicken’s legs and feet. What you see instead is their damage: the normally smooth, flat leg scales lift up and thicken, giving the legs a rough, crusty, almost coral-like texture.
In early stages, the scales just look slightly raised or uneven. As the infestation progresses, the skin becomes visibly thickened and lumpy, sometimes with a whitish or chalky buildup between the scales. In severe cases the swelling around the legs and toes can get bad enough to restrict movement at the joints, and toes can become deformed. The condition develops slowly over weeks or months, so it’s easy to overlook until it’s well established. Any chicken with legs that look rough and raised rather than smooth and tight against the leg likely has scaly leg mites.
How to Tell Which Mite You’re Dealing With
The quickest way to narrow it down is by location. If you find tiny specks crawling on the bird during the day, especially around the vent, you’re looking at northern fowl mites. If you find them in coop crevices at night but not on the birds during daytime inspections, those are red mites. If you see no crawling mites at all but notice thickened, crusty leg scales, the problem is scaly leg mites.
For red mites and northern fowl mites, a simple magnifying glass or even a phone camera on macro mode can help you confirm what you’re seeing. Both species have a rounded body, eight legs (in the adult stage), and are just barely visible without magnification. Scaly leg mites require a microscope to see directly, so identification relies entirely on the characteristic leg damage they cause. A flashlight and a close look at the vent feathers and leg scales during a routine health check will catch most mite problems before they become severe.