Garden birds are a joy to watch, but they face many challenges, including disease. Recognising the early signs of illness can help you act quickly to protect your feathered visitors and prevent outbreaks at your feeders.

Why early detection matters

Diseases such as trichomonosis, avian pox and salmonellosis can spread rapidly where birds gather. A single sick bird at a feeder can infect many others. By spotting the signs early, you can take steps to break the cycle of infection. This is especially important in spring and summer when young birds are vulnerable, and in winter when birds rely heavily on supplementary food.

Common signs of illness to look for

Healthy garden birds are alert, active and have sleek plumage. Sick birds often behave differently. Look for any of the following:

• Fluffed-up feathers: A bird that sits hunched with its feathers puffed up, even in mild weather, is likely unwell. This helps them conserve heat but is a classic sign of illness.
• Lethargy: A sick bird may not fly away when you approach, or may sit still for long periods with its eyes closed.
• Unusual growths: Knobbly lumps or swellings on the feet, legs, face or beak can indicate avian pox or other infections. These are often greyish or pinkish and may look like cauliflower.
• Difficulty eating or drinking: Food falling from the beak, repeated swallowing attempts, or a bird sitting at the feeder but not eating can signal throat lesions, common with trichomonosis.
• Eye problems: Cloudy, swollen or discharging eyes, or a bird that keeps one eye closed, can be a sign of infection.
• Breathing difficulties: Laboured breathing, tail bobbing, or wheezing sounds are serious warnings.
• Diarrhoea: Soiled vent feathers or watery droppings that are not normal for the species.
• Loss of balance or trembling: Neurological signs such as head tilting, trembling or seizures can occur with some diseases.

What to do if you spot a sick bird

First, don't panic. But do act promptly. If you see one or more birds showing these signs, take the following steps:

• Stop feeding temporarily: Remove all feeders and bird baths for at least two to three weeks. This encourages birds to disperse and reduces the chance of transmission.
• Clean thoroughly: Empty and clean feeders, drinkers and baths. Use hot soapy water and a brush to remove all debris. Then disinfect with a bird-safe disinfectant or a diluted bleach solution (one part bleach to nine parts water). Rinse well and allow to dry completely before refilling.
• Wear gloves: Always wear gloves when cleaning or handling feeders, and wash your hands thoroughly afterwards.
• Dispose of dead birds safely: If you find a dead bird, do not touch it with bare hands. Use gloves or a plastic bag, double-bag the carcass and place it in an outdoor bin. If several deaths occur, report it.
• Keep other birds safe: Isolate any sick bird if you have an aviary or keep poultry, but do not attempt to treat wild birds yourself. Contact a vet or wildlife rehabilitator for advice.

Cleaning feeders and nest boxes properly

Regular cleaning is your best defence against disease. Aim to clean feeders every week or two, and more often if you see sick birds or in warm, damp weather. Here's how:

• Use a dedicated brush to scrub all crevices.
• Clean bird baths every few days, and refill with fresh water.
• Rotate feeding stations around the garden to avoid a build-up of droppings and parasites.
• At the end of the breeding season, clean out nest boxes. Remove old nesting material, scrub with hot soapy water, rinse and dry thoroughly. Do not use chemicals inside nest boxes.
• Store bird food in a cool, dry place and discard any that is mouldy or damp.

Reporting concerns to a wildlife health scheme

Your observations can help track disease outbreaks across the country. If you see birds with unusual signs, especially multiple birds or deaths, report it to a wildlife health scheme. These schemes collect data from the public to monitor emerging threats and inform conservation action. When reporting, note the species affected, the signs you observed, the location, and the date. Take photographs if possible, but do not handle sick birds. Even a single report can be valuable.

Preventing disease in your garden

Good hygiene and sensible feeding practices go a long way. Avoid overcrowding by providing several feeding stations spread out. Offer a variety of foods to reduce competition, and never put out mouldy or stale food. Clean up spilled seed and droppings regularly. If you use feeders, choose designs that are easy to dismantle and clean. Provide clean water for drinking and bathing, but change it daily. Finally, keep an eye on your birds: regular observation means you'll notice problems quickly and can act to keep your garden a safe haven for wildlife.