Learning how to recognise red mites early is the single best thing you can do for your flock, because these tiny blood-sucking parasites hide in the coop by day and feed on your hens at night, often going unnoticed until birds are visibly suffering. This guide explains what red mites are, what they look like before and after feeding, how they spread, where they hide, and the effects they have on poultry — so you can spot the signs of red mites in chickens before an infestation takes hold.
Short answer: Red mites (Dermanyssus gallinae) are pinhead-sized parasites that look greyish-white when unfed and red or rust-brown after a blood meal. Look for crawling specks and ash-like grey deposits in perch ends and crevices, plus restless hens reluctant to roost, pale combs and a sudden drop in laying.
What are red mites?
Red mites, properly called Dermanyssus gallinae, are external parasites (exoparasites) that live in poultry housing rather than on the bird itself. Unlike lice, which spend their whole life on the hen, red mites shelter in the coop during the day and emerge at night to feed on your chickens' blood, then retreat to hide. That nocturnal habit is exactly what makes them so hard to detect — you can inspect a bird in daylight and find nothing, while thousands of mites sit waiting in the woodwork a few centimetres away.
They are one of the most common and persistent pests in backyard poultry keeping, and they reproduce alarmingly fast, so knowing how to identify them is the foundation of keeping a healthy flock.
How to recognise red mites: what they look like
Adult red mites are tiny — roughly the size of a pinhead (under 1mm) — so colour and grouping are your best clues:
- Before feeding (day): unfed mites and juveniles look greyish-white, off-white or translucent, and can be very hard to see individually.
- After feeding (night): once they have taken a blood meal they swell and turn bright red, then deep red or rust-brown as the blood darkens. This colour change is where the name comes from.
- In numbers: heavy infestations leave grey, ash-like or "salt and pepper" deposits — a mix of live mites, droppings, eggs and shed skins — clustered around perch ends, joints and crevices.
A classic test is to wipe a white tissue or cloth along the underside of perches and into crevices after dark: if it comes away with smears of red, you have red mites. Some keepers also report an itchy, crawling sensation on their hands and arms after handling an infested coop.
Red mite lifecycle and how they spread
The red mite lifecycle is brutally efficient. In warm conditions a mite can go from egg to breeding adult in as little as 5–10 days, which means a small problem can explode into a full infestation within a couple of weeks. A single hen can end up hosting many thousands of mites, and populations build fastest through the warmer months — spring, summer and autumn — before slowing in cold weather.
Red mites typically arrive in your set-up by:
- Wild birds: sparrows, pigeons and other visitors carry mites into gardens, runs and feeders.
- New or rescue hens: birds from commercial flocks or unknown sources can bring mites with them, so it pays to quarantine and check new arrivals.
- Second-hand coops and equipment: mites and their eggs survive for months in the cracks of a used wooden coop, perch or nest box — a bargain second-hand house can come with an unwelcome population already installed.
Where red mites hide in the coop
Because red mites live in the housing and not on the bird, knowing where to look is half the battle. They favour warm, dark, undisturbed spots close to where the hens roost, including:
- The ends of perches and where perches slot into their supports.
- Cracks, crevices and tongue-and-groove joints in timber.
- Under felt roofing and inside nest boxes.
- Any seam or gap within a few centimetres of the roosting birds.
This is where traditional timber coops are at a real disadvantage: soft wood, splits and joints give mites an almost endless network of hiding places that are impossible to fully clean. By contrast, Nestera's recycled-plastic coops have smooth, non-porous walls with no cracks for mites to colonise, which is one of the big reasons keepers switch from wood — see 8 reasons to avoid wooden coops for the full comparison.
Signs of red mites in chickens
You will often notice the effects on your hens before you spot the mites themselves. Watch for:
- Reluctance to go into the coop or roost — birds sense the biting and may prefer to perch elsewhere at night.
- Restlessness and disturbed sleep, with hens unsettled or noisy after dark.
- Pale combs and wattles, a tell-tale sign of blood loss and anaemia.
- A sudden drop in egg laying, sometimes with thinner or paler shells.
- Lethargy, weight loss and dull, ruffled feathers.
- Excessive preening, feather pecking or scratching.
If you suspect mites, the next step is a hands-on inspection. Our guide on how to check your hen for lice and red mites walks you through exactly what to look for on the bird and in the coop.
The effects of red mites on poultry
Red mites are far more than a nuisance — a heavy infestation can seriously harm a flock and, in severe cases, prove fatal. The main effects on poultry are:
- Anaemia and blood loss: constant nightly feeding drains a bird's blood, causing pale combs, weakness and lethargy. Young, old or already-poorly birds are most at risk, and severe anaemia can kill.
- Reduced laying and productivity: stressed, sleep-deprived hens lay fewer eggs, and shells may become thinner or paler.
- Stress, restlessness and poor welfare: being bitten all night leaves birds exhausted, anxious and reluctant to roost, which can trigger feather pecking and other abnormal behaviours.
- Skin irritation and secondary infection: bites cause itching and damage that can become infected.
- Disease spread: red mites can act as carriers for poultry diseases, adding a further health risk on top of the direct damage.
What to do if you find red mites
If you confirm red mites, act quickly — their fast lifecycle means delay only makes things harder. The most effective control focuses on the environment rather than the bird, since the mites live in the coop. A smooth, easy-clean, recycled-plastic coop makes this far simpler: large rear hatches, removable roofs and detachable nest boxes let you strip it down and clean every surface, with no timber cracks for mites to retreat into.
For the full step-by-step approach to spotting, treating and clearing an infestation, see red mite: how to spot them, treat them and prevent them, and to stop them coming back read our 5 tips to avoid red mites in your chicken coop.
For any treatment that involves medication, products applied to the birds, or dosing of drinking water, please consult your vet or a qualified poultry specialist. They can confirm the diagnosis and recommend a safe, suitable course of action for your flock — this article is for identification and prevention rather than veterinary advice.
The video below shows just how quickly a clean-down can be done on an easy-clean coop:
Frequently asked questions about red mites
How do I know if my chickens have red mites?
Check the coop after dark with a white tissue: wipe along perch ends and crevices, and look for red smears, crawling specks and grey ash-like deposits. On the birds, watch for pale combs, reluctance to roost, restlessness at night and a sudden drop in laying.
What do red mites look like to the naked eye?
They are pinhead-sized. Unfed mites are greyish-white or translucent and easy to miss; after feeding on blood they swell and turn bright red to rust-brown. In large numbers they look like a grey, "salt and pepper" dust clustered in joints and perch ends.
Are red mites harmful to chickens?
Yes. By feeding on blood night after night they cause anaemia, stress, reduced egg laying and poor welfare, and severe infestations can be fatal — especially for young, old or already-weak birds. Early recognition is key to preventing serious harm.
Can a plastic coop get red mites?
Mites can still arrive via wild birds or new hens, but smooth, non-porous recycled-plastic coops give them nowhere to colonise and are far easier to clean thoroughly than timber, so infestations are much easier to control and prevent.
Protect your flock with an easy-clean coop
The best long-term defence against red mites is housing that gives them nowhere to hide and that you can clean in minutes. Nestera's recycled-plastic chicken coops have smooth, crack-free walls, removable roofs and detachable nest boxes — maintenance-free, UV-resistant and built to keep your hens healthy for years. Explore the range and give red mites one less place to call home.
