Bird Food
Peanuts for Birds
Peanuts are the second most powerful food in a backyard after sunflower, and the one most surrounded by bad advice. The choking myth is nonsense. The mold risk is not.
The short answer
- Peanuts are high in fat and protein and are taken by nuthatches, titmice, chickadees, woodpeckers, jays, wrens and starlings.
- Peanut butter does not choke birds. That claim has no evidence behind it. The real issues are salt, additives and rancidity.
- Buy unsalted, unroasted or plain roasted peanuts sold for wildlife. Never flavored, seasoned, honey-roasted or salted nuts.
- Peanuts and corn are the two feeder foods most prone to aflatoxin. Buy from a supplier with turnover, store dry and sealed, and discard anything moldy, dusty or stale.
- Mixing peanut butter with cornmeal or oats gives a stiffer, less greasy, longer-lasting food and makes an expensive jar go three times as far.
Peanuts are roughly 45 to 50 percent fat and around 25 percent protein, which puts them close to suet in energy density and well ahead of any seed. Put a mesh tube of peanut pieces out and the first birds on it are usually the white-breasted nuthatch (Sitta carolinensis), the tufted titmouse (Baeolophus bicolor) and a downy woodpecker (Dryobates pubescens), often within a day or two.
Peanuts are also a legume, not a tree nut, and they grow underground, which is exactly why they carry more mold risk than most feeder foods.
This page covers which form to buy, how peanut butter really works and why the choking story is wrong, the aflatoxin and salt rules that do matter, and how to serve peanuts without simply funding your local squirrel population.
Which birds eat peanuts#
Peanuts appeal to the clinging, caching and probing birds rather than the seed-crackers.
- Nuthatches, both white-breasted and red-breasted. Nuthatches will hammer a peanut piece into bark to open it, and will cache dozens.
- Tufted titmice and chickadees, which take one piece, fly to a branch, hold it underfoot and chip at it.
- Woodpeckers: downy, hairy and red-bellied especially. Peanuts are one of the fastest ways to add woodpeckers to a yard, alongside the approach in how to attract woodpeckers.
- Blue jays, which prefer in-shell and will empty a tray into a cache in twenty minutes.
- Carolina wrens, which take peanut fragments and peanut butter mixes readily.
- European starlings, unfortunately, and in numbers. If starlings arrive, the answer is a mesh or caged feeder rather than giving up on peanuts; keeping starlings off feeders covers the rest.
Goldfinches, house finches, doves and juncos show almost no interest.
Which form to buy#
| Form | Who it suits | Feeder | Notes |
|---|---|---|---|
| In-shell | Jays, woodpeckers, squirrels | Open tray or wire spike | Shell keeps kernels fresh; messiest |
| Shelled halves | Nuthatches, titmice, jays | Mesh peanut tube | The general-purpose choice |
| Peanut pieces / chips | Chickadees, wrens, small woodpeckers | Fine mesh, suet cage | Best in nesting season, spoils fastest |
| Peanut butter | Nearly everything above | Log, plug or smeared cone | Mix with cornmeal before use |
| Peanut hearts | Starlings and blackbirds mostly | Any | Cheap, oily, sours fast; usually skip |
Peanut hearts are the split germ left after processing. They are cheap and they turn up in budget mixes, but they go rancid quickly and they are disproportionately attractive to starlings. Shelled halves are the better buy.
Only plain, unsalted, human-grade or wildlife-grade peanuts
No salted, roasted-and-seasoned, honey-roasted, chili, or candy-coated nuts. No peanuts from a bag that lists anything beyond peanuts and possibly oil. Salt is the specific problem, and it belongs on the same list as the other items in what not to feed birds.
Peanut butter: the myth and the real problems#
The claim that peanut butter chokes birds, or gums up their throats, circulates every winter and has no documented basis. Birds do not swallow the way the story assumes, and peanut butter has been used in bird food recipes for decades without a body of evidence behind the warning. Treat it as folklore.
What genuinely matters is simpler.
Salt and additives#
Buy plain. Reduced-fat spreads add sugar and starch, and some specialty products contain xylitol, which has no business anywhere near wildlife. The ingredient list you want reads "peanuts", possibly with salt you would rather avoid, and nothing else.
Rancidity in heat#
Peanut butter is unstable oil. In a hot yard it separates, drips, and goes rancid within days. Above roughly 80°F (27°C) put out small amounts, in shade, and refresh them often, or switch to a stiff dough as described under no-melt summer mixes.
Smearing it thickly in freezing weather#
The one legitimate cold-weather caution is texture, not choking. A thick smear of pure peanut butter on bark at 15°F (-9°C) sets hard and can adhere to feathers around a bird's face. Two easy fixes: cut it with cornmeal or oats until it is crumbly rather than sticky, and offer it in a log or plug feeder rather than smeared on a surface.
The one-to-one-to-two cornmeal mix
Stir 1 part peanut butter into 1 part lard or rendered fat, then work in about 2 parts cornmeal and rolled oats until the mix holds its shape on a spoon. It is stiffer, less greasy, cheaper per serving and it stays put in a suet log or packed into a pine cone.
Aflatoxin and freshness#
Peanuts and corn are the two feeder foods most prone to aflatoxin, a toxin produced by Aspergillus molds that develop on the crop in warm, damp conditions. Birds are more sensitive to it than we are, and the harm comes from repeated feeding on a bad batch rather than a single mouthful.
The controls are practical rather than dramatic:
- Buy from a supplier with real turnover. A sack that has sat warm through a summer is the risk, not peanuts as a category.
- Buy in quantities you will use inside a month, and resist the bulk sack unless you have a busy yard.
- Store sealed, cool and dry, in metal or hard plastic, following storing bird seed.
- Throw out anything with visible mold, a musty smell, shriveled or discolored kernels, or heavy dust at the bottom of the bag. Do not sort the good from the bad.
- Never re-offer peanuts that have been rained on. Wet shelled peanuts mold within a day or two in mild weather.
Feeders and placement#
A mesh peanut tube with openings of about 1/4 inch (6 mm) is the standard tool: birds pull fragments through the mesh, which slows consumption and keeps jays from bulk-hauling. Full options are in peanut feeders.
Hang it where clinging birds have a nearby branch to retreat to, roughly 10 to 12 feet (3 to 3.5 m) from cover. Nuthatches and titmice almost never eat at the feeder; they take a piece and leave, so the trip to cover is part of the design.
Mesh feeders trap oil and damp in the weave, so wash them more often than a seed tube. Peanut oil oxidizes into a sticky brown film on the mesh, and that film is what sours the next filling. Hot soapy water and a stiff brush every week or two is enough; let the feeder dry completely before refilling, because damp mesh and peanut fragments are a mold pairing.
Open trays of in-shell peanuts are a different proposition. They work, jays love them, and they are impossible to keep dry. Use a tray with a mesh floor, put out a dozen nuts at a time, and clear anything left by dusk.
Nesting season and squirrels#
Two seasonal cautions worth planning around.
Late spring through midsummer, whole peanuts and large halves can be carried to a nest and fed to chicks that cannot handle them. Switch to peanut chips in a fine mesh feeder, or stop peanuts for six weeks and lean on the guidance in feeding during nesting season.
The nesting-season switch is a size change, not a ban
You do not have to stop feeding peanuts in spring. You have to stop offering pieces big enough to lodge in a nestling's throat. A fine mesh feeder filled with chips does the job, because the bird has to work fragments out through the mesh rather than carrying a whole kernel away.
Squirrels treat peanuts as the best thing you have ever done for them. In-shell peanuts on an open tray are effectively squirrel feeding with birds as a side effect. If that is not the plan, use a mesh tube on a baffled pole and follow how to stop squirrels raiding feeders.
A peanut setup that works#
- Shelled peanut halves in a mesh tube, on a baffled pole, 10 to 12 feet (3 to 3.5 m) from cover.
- A month's supply at a time, stored sealed and cool, discarded at the first musty smell.
- A peanut butter and cornmeal dough in a log feeder from late fall through early spring, cut back or moved to shade above 80°F (27°C).
- Peanut chips only from roughly May through July, so nothing oversized reaches a nest.
- In-shell peanuts on a separate tray if you actively want jays, sited away from the main station.
- Weekly cleaning of the mesh, because peanut oil residue is what turns a good feeder into a sour one.
Pair the peanuts with a suet feeder and you have covered nearly every clinging bird a North American yard can hold.
Frequently asked questions#
Is peanut butter safe for birds?
Yes. The idea that birds choke on peanut butter is a persistent myth with no documented evidence behind it. Birds do not swallow in the way that claim assumes. The genuine concerns are salt and added sugar, xylitol and other additives in specialty spreads, and peanut butter going rancid or runny in heat. Use a plain, unsalted product and mix it with cornmeal or oats.
What birds eat peanuts?
White-breasted and red-breasted nuthatches, tufted titmice, chickadees, downy, hairy and red-bellied woodpeckers, blue jays, Carolina wrens, and in some yards cardinals and grackles. Starlings also love peanuts, which is the main reason people move to caged or mesh peanut feeders.
Should I feed peanuts in the shell or shelled?
Both, for different birds. In-shell peanuts suit jays, woodpeckers and squirrels, and they stay fresh longer because the shell protects the kernel. Shelled peanut halves and pieces suit nuthatches, titmice, chickadees and wrens, and they go in a mesh feeder. Shelled peanuts spoil faster once wet.
Can baby birds eat peanuts?
Whole peanuts and large pieces are a genuine choking hazard for nestlings that adults may carry to the nest. During nesting season, offer peanuts only as small chips in a mesh feeder that forces birds to take fragments, or pause whole peanuts entirely from late spring through midsummer.
Are salted peanuts bad for birds?
Yes. Birds have very limited ability to handle excess sodium, and salted, seasoned or honey-roasted nuts should never go out. Buy peanuts sold for wildlife or plain unsalted human-grade peanuts. Dry roasted with no coating is acceptable; anything with a flavor listed on the label is not.