Foods you should never feed wild birds

Do not feed wild birds mouldy food, salty snacks, greasy cooking residues or food whose ingredients you cannot identify. Milk is not a substitute for drinking water. Avoid dry hard bread for nestlings, and keep grapes and dried vine fruits away from any garden that dogs can access.

Food safety also depends on timing and presentation: clean seed can still be the wrong choice during the May–October seed pause, and fresh food can still spread disease on a shared flat tray.

Foods to avoid, and why

The RSPCA's food-safety advice specifically excludes dried coconut, cooked porridge oats, milk, cooking fat, and mouldy or salted food. Some other foods are poor supplementary choices rather than universal poisons. Freshness and how food is offered matter as well as the ingredient.

Mould is a reason to discard food

A little fresh seed added to a clumped base does not make the old food safe. Empty the feeder, remove the contaminated contents and clean it before putting out a new portion.

Check stored food as well as the feeder. Damp bags, condensation in a container and chewed packaging all deserve attention. If a bulk bag has become contaminated, do not sieve out visible lumps and carry on feeding the remainder.

BTO hygiene advice stresses fresh food and cool, dry storage. Peanuts need particularly careful sourcing because poor-quality nuts can carry aflatoxin. Use our peanut guide for supplier and mesh-feeder checks.

Salted human snacks are not bird food

Salted sunflower seeds, roasted snack peanuts, crisps and heavily seasoned food should not be offered. “Birds eat sunflower seeds” does not mean the flavoured human version is a suitable purchase.

For leftovers, read the actual recipe rather than looking only at the main ingredient. Rice with sauce is not plain rice; potatoes covered with gravy are not plain boiled potato. If you cannot separate out what was added, it is simpler to leave the dish out.

The kitchen-scraps guide gives a narrow shortlist rather than encouraging a general leftovers buffet.

Cooking fat is not the same as bird suet

Roast drippings contain a mixture of cooking residues and can be greasy and perishable. Do not mix them with seed to make homemade food blocks or pour them onto a feeding surface.

A suitable commercial suet cake has a defined recipe and intended holder. That makes selection easier, but does not grant indefinite outdoor life. Remove it if it becomes spoiled, dirty or unsuitable in heat. Our suet-block guide explains food pack sizes and holder fit.

Vegetable cooking oil and softened greasy spreads should not be treated as an inexpensive feeder refill either.

Bread, milk and young birds

Bread is not a useful staple for garden birds. Dry hard pieces are a particular concern during spring and summer, when adults may take food to chicks. Do not soak old bread in milk and regard it as a better feeding mixture.

Milk should not be provided as a drink. A bird bath is for clean water, with its own daily replacement and cleaning routine; adding food or milk makes it harder to keep hygienic. See winter water advice for freezing conditions.

Do not hand-feed a fledgling with kitchen food or put food into an occupied nest box. A young bird on the ground does not automatically need feeding by a person; seek appropriate wildlife advice if injury or genuine danger is suspected.

A separate warning for dogs

Grapes and dried vine fruits can be toxic to dogs. This is a pet-safety warning, not a claim that blackbirds cannot eat raisins. A raised dish does not solve it because fruit can fall or be carried away.

Avoid these foods in dog-accessible gardens and choose fresh apple or pear if fruit provision is appropriate. PDSA advises contacting a vet immediately if a dog may have eaten grapes, raisins, sultanas or currants. Do not wait for symptoms or attempt a home remedy.

Our safe-fruit guide explains the simpler alternatives.

Good food can still be offered badly

Follow current RSPB guidance: no flat-surface feeders; seasonal seed and peanut provision; small fresh portions rather than long-lasting shared food patches.

Removing visible dirt daily does not guarantee that birds cannot share contaminated food. Avoid broad catchers and permanent piles, clear beneath feeders and move positions. If birds seem unwell, stop provision and follow authoritative disease advice rather than simply changing the brand.

Useful equipment for avoiding contaminated food

A long feeder brush helps reach a narrow tube and its base. Use it only for bird-feeding equipment, outside the kitchen; it is not a substitute for dismantling, washing, rinsing and drying.

A small indoor pour container can help you measure modest dry portions. The DEAYOU container is a storage aid, not a rodent-proof outdoor bin and not a place for soaked mealworms. Wash it before changing batches and do not decant new food on top of stale crumbs.

Frequently asked questions

Is bread poisonous to birds?

Not universally. It is a poor regular choice, and dry hard bread can be unsuitable for chicks. Appropriate bird food is a better option.

Can I cut mould off fruit for birds?

Do not offer a visibly spoiled fruit. Choose sound fruit instead of using birds to dispose of it.

Does a “safe for birds” label remove all risk?

No. Freshness, seasonal use, feeder design and cleaning remain important. Follow the current welfare advice as well as the product label.