Bird Food
Cracked Corn
Corn is the seed most likely to be genuinely bad for birds, and it has nothing to do with corn itself. It is about how the bag was stored, and how long you leave it on the ground.
The short answer
- Cracked corn is eaten mainly by ground feeders and large birds: doves, jays, quail, turkeys, crows, blackbirds, sparrows and squirrels.
- Corn is the food most prone to aflatoxin, a mold toxin that is genuinely harmful to birds. Buy from a store with fast turnover, keep it dry, and throw out anything discolored, dusty or caked.
- Medium cracked is the size to buy. Whole kernels are too big for most feeder birds and fine corn meal turns to paste in the rain.
- Corn draws deer, raccoons, rodents and bears more reliably than any other feeder food.
- Put out a day's worth at a time on a hard surface you can sweep, never a heap on wet ground.
Cracked corn is dried field corn run through a mill until the kernels break into pieces roughly the size of a match head. It is the cheapest bird food per pound sold in North America, it is eaten by doves, jays, quail, turkeys, sparrows and blackbirds, and it is ignored by chickadees, finches and nuthatches.
It is also the only common feeder food with a real toxicology problem attached, and the one most likely to turn your yard into a raccoon buffet.
None of that makes corn a mistake. It makes corn a food with rules. This page covers who actually eats it, how to buy and store it so mold never becomes an issue, what else it attracts, and the situations where the honest answer is to skip corn entirely.
What you are buying: grade, grind and dust#
Cracked corn is sold in three grinds, and the middle one is the only one worth your money for songbirds.
| Form | Piece size | Best for | Watch out for |
|---|---|---|---|
| Whole kernel | 1/3 in (8 mm) | Turkeys, ducks, jays, squirrels | Too large for most songbirds |
| Medium cracked | 1/8 in (3 mm) | Doves, sparrows, juncos, jays, cardinals | The default choice |
| Fine cracked / meal | Powder to grit | Almost nothing at a feeder | Absorbs water, cakes, molds fast |
Corn sold for wild birds is not held to human food standards, and there is no meaningful grading you can read off a bag. What you can judge is the physical product. Pour a handful. Good corn is uniform pale yellow, dry, and makes almost no dust. Corn with dark or gray pieces, a musty smell, or a cloud of fines at the bottom of the bag has been stored badly and should go back.
Buy from a feed store or garden center that visibly moves stock. A dusty sack that has sat on a hot shelf all summer is the single worst purchase you can make in the bird food aisle, including in the bagged mixes that use corn as bulk.
Aflatoxin, in proportion#
Aflatoxin is a toxin produced by Aspergillus molds that grow on grain in warm, damp conditions. Corn is the most susceptible common feeder food, with peanuts close behind. Birds are more sensitive to it than mammals, and the damage is to the liver rather than anything you would notice as an obvious poisoning.
Two things make this worth taking seriously without panic:
- Contaminated grain does not reliably look or smell wrong. Visible mold is a certain no, but the absence of visible mold is not a guarantee.
- The dose that matters accumulates. A bird eating from the same bad batch every day for weeks is the realistic risk, not one contaminated mouthful.
The practical controls are dull and effective: buy small quantities, buy where stock turns over, store the corn dry and sealed, put out only what is eaten within a day, and never re-use corn that has been rained on. That is the whole protocol.
Never feed corn that has caked, sprouted or smells sour
Caked, clumped or sour-smelling corn goes in the trash, not on the ground and not into the compost where birds will find it anyway. The same applies to corn you find at the bottom of a feeder after a wet week. See moldy, clumped or wet seed for how to tell the difference between damp and dangerous.
Which birds eat cracked corn#
Corn is a ground-feeder food, so the guest list is the flat-surface crowd:
- Mourning doves, which take it greedily and swallow it whole.
- Blue jays (Cyanocitta cristata), which will carry off several pieces at a time to cache.
- Northern bobwhite, California quail and wild turkeys, where you have them.
- Juncos, native sparrows and towhees, though they usually prefer white proso millet if both are offered.
- Northern cardinals, which take corn from a tray but rate it well below sunflower and safflower.
- Crows, grackles, red-winged blackbirds and starlings, enthusiastically. This is the part most people do not want.
Nothing that uses a tube feeder is on this list. If your yard is set up around black oil sunflower and small perching birds, corn will not add a single new species you were hoping for.
What else corn brings in#
Cracked corn is the most effective mammal attractant sold in the bird section. In rough order of how quickly they will find it:
Squirrels and chipmunks arrive first, usually within a day. Rodents follow, because corn on the ground overnight is a nightly meal that supports a population. This is the mechanism described in rodents under bird feeders. Raccoons learn a corn spot fast and are hard to unlearn; see keeping raccoons off bird feeders. Deer will stand in a suburban yard eating corn at dusk, which is charming until it is not: deer eating bird seed. Bears, in bear country, are a different category of problem entirely. If you are inside black bear range, read bird feeders and bears before you put corn on the ground at all.
Corn is a daytime, small-portion food
Almost every corn problem is a storage problem or an overnight problem. Corn scattered in the morning and gone by mid-afternoon causes very little trouble. A permanent pile causes all of it.
How to offer corn without regret#
- Use a hard, sweepable surface: a mesh ground tray, a low platform feeder, a patio slab or a gravel patch. Never bare lawn, where corn works into the thatch and stays wet.
- Put out a single day's worth, which in most yards is a cup or two.
- Offer it in the morning, so it is gone before the nocturnal mammals are moving.
- Keep it away from the main feeding station if you can. Blackbirds and grackles that find corn will start working your other feeders too, a spiral covered in grackles and blackbirds taking over.
- Sweep the spot at least weekly and rotate it every few weeks.
A raised ground feeder with a mesh floor solves most of this at once. Corn drains, dries and stays visible, so you can see when to stop.
Cost per useful calorie#
Corn is cheap by the pound, which is why it fills budget mixes. It is not cheap by the calorie that reaches a bird you wanted.
Sunflower is roughly 40 percent fat by weight; corn is closer to 4 percent, mostly starch. For a chickadee burning through a winter night, that difference is decisive, which is why high-energy winter foods lean on fat rather than grain. Corn earns its place for bulk-feeding ground birds in cold weather and for holding jays and doves away from a seed feeder, not as a nutritional equal.
If you are buying corn to save money on a mix, the better move is usually to buy less seed of a better type. A bag that is half corn is half a bag.
When to skip corn entirely#
There are yards where corn is simply the wrong call:
- Bear country, in any season the bears are awake.
- Dense urban and suburban blocks with an existing rat problem.
- Anywhere with a starling or grackle flock already established.
- Hot, humid summers in the Southeast and Gulf states, where a day-old corn pile on damp ground is close to a mold culture. Warm-season feeding is better built around foods that do not sit and sweat.
- Any yard where seed sits out overnight as a matter of routine.
A cleaner substitute for most yards
If what you want is ground-feeding birds, white proso millet does the same job with less mammal interest and far less mold risk. Keep corn for the specific case where you want jays, doves or turkeys, and where you can offer it on a swept surface in daylight.
A corn routine that works#
- Buy medium cracked corn in the smallest useful bag, from a store with visible turnover.
- Transfer it immediately to a sealed metal or hard plastic container kept cool and dry, as described in storing bird seed.
- Offer one to two cups in the morning, on a mesh tray or swept hard surface.
- Check what is left at dusk. If corn is still there, you are putting out too much.
- Sweep weekly, rotate the spot monthly, and wash any tray you use on the same schedule as your other feeders.
- Stop for the season at the first sign of rats, raccoon visits, or a resident blackbird flock, and reassess before restarting.
Frequently asked questions#
What birds eat cracked corn?
Mourning doves, blue jays, crows, quail, wild turkeys, juncos, native sparrows, cardinals, grackles, red-winged blackbirds and starlings. It is a ground food, so the birds that eat it are the ones that feed on flat surfaces. Chickadees, finches, nuthatches and titmice show almost no interest.
Is cracked corn bad for birds?
Good corn is a perfectly reasonable food. Moldy corn is not. Corn is the feeder food most likely to carry aflatoxin, a mold toxin that can kill birds at levels too low to see or smell reliably. The safe approach is to buy small quantities from a supplier that sells through stock quickly, store it sealed and dry, and discard any corn that is caked, dusty, discolored or has been rained on.
Should I use whole corn or cracked corn?
Cracked, at a medium grind. Whole kernels are too large for most songbirds and are really only useful for turkeys, ducks, jays and squirrels. Fine cracked corn or corn meal absorbs water fast and turns into a paste that molds within a day or two in warm weather.
Does cracked corn attract rats and raccoons?
Yes, more than any other common bird food. Corn is cheap, calorie-dense and usually offered on the ground, which is exactly what rodents, raccoons, deer and, in bear country, bears are looking for. If you use corn, offer only what disappears before dark and sweep up the remainder.
Can I feed birds popcorn or corn on the cob?
Plain unsalted, unbuttered popped corn is harmless but nutritionally thin and goes soggy immediately. Whole cobs sold as squirrel food do exactly what the label suggests: they feed squirrels. Neither is a substitute for cracked corn, and salted or flavored popcorn should never go out.