Last updated: August 21, 2026
There is a particular morning that turns a casual feeder watcher into someone who reads about perch lengths. You look out and there are eleven grackles on and around the feeder, a starling has its head inside the suet cage, and the chickadees are lined up in the hedge waiting for a gap that is not coming. By lunchtime the feeder is empty and the ground is a carpet of shells.
None of that is a pest problem to be solved with force. It is a design problem, and the fix is the same one the Cornell Lab describes: change what the feeder physically allows, and the big birds go somewhere easier. This guide covers what actually excludes grackles, starlings and doves, and what it costs you in the birds you still want.
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Quick Answer
How do you keep grackles and starlings off a bird feeder?
- Short perches. Project FeederWatch notes they accommodate small birds such as finches but exclude larger birds such as grackles and jays.
- Bottom access suet cages. Cornell describes these as starling resistant while still letting woodpeckers, nuthatches and chickadees feed upside down.
- Thick shelled seed. Cornell notes striped sunflower and safflower are more difficult for blackbirds to open.
- Skip the platform tray and stop scattering food on the ground, which is Project FeederWatch’s direct advice for grackles.
Bottom line: exclude by geometry and by seed choice, never by harming a bird, and accept that flocks move on anyway.
Why the Big Birds Win by Default
Most feeders are built to be easy to eat from, and easy favors the biggest bird present. A wide tray, a long perch, an open platform and a scatter of seed on the ground are all invitations that a grackle, a starling or a dove can accept and a chickadee cannot defend. Nothing is going wrong. The feeder is doing exactly what it was designed to do.
That is why the working solutions are all subtractions. You take away the standing room, take away the ground spill, or take away the seed the big birds prefer, and the yard rebalances within a week or two without a single confrontation.
Short Perches: The Cheapest Fix
Project FeederWatch states it plainly: feeders with short perches accommodate small birds such as finches but exclude larger birds such as grackles and jays. A grackle needs somewhere to plant its feet and balance a long body. A goldfinch needs about a centimeter of plastic. Build for the goldfinch and the grackle gives up.
The catch is that short perches also exclude birds you probably want, cardinals in particular, since Cornell notes cardinals and grosbeaks tend to prefer tray and hopper feeders. That is why the usual setup is two feeders rather than one: a short perch tube for the small birds and a separate hopper of safflower where the cardinals eat undisturbed.
Remove the Tray Underneath
Catch trays are sold as a tidiness feature and they quietly undo the perch trick, because a tray is standing room. If grackles have colonized a tube feeder that used to be fine, look at what got added underneath it. Taking the tray off costs nothing and often solves the problem on its own.
Cages, and the Grid That Decides Everything
A cage is a wire grid around a feeder that small birds pass through and big birds do not. It is the most reliable exclusion in the yard because it does not depend on a bird choosing to give up, and the same hardware keeps squirrels off the seed at the same time.
Grid size is the whole design. Too wide and a grackle gets its head and shoulders through; too tight and you exclude cardinals and jays along with them. Our caged feeder guide goes through the grid dimensions, and feeders only small birds can get into covers the versions built for chickadees, titmice and finches specifically.
Suet: The Upside Down Trick
Suet is where starlings do the most damage, and it is also where the cleanest fix exists. Project FeederWatch recommends providing suet in starling proof feeders, meaning feeders that allow access to the suet only from the bottom, and notes that these cages tend to be starling resistant while still letting woodpeckers, nuthatches and chickadees feed by clinging upside down.
Resistant is the right word rather than proof. Determined starlings work out a way onto some designs, and FeederWatch participants have described adding a baffle plate below the cake to shrink the space underneath so only smaller birds fit. Our upside down suet feeder guide covers which designs hold up and where they fail.
What Excludes What
Each row below pairs a bird with the exclusion the Cornell Lab and Project FeederWatch describe for it, plus the bird you may lose in the process. That last column is the part most articles leave out.
| Bird | Why it dominates | What excludes it | What you also lose |
|---|---|---|---|
| Common Grackle | Flocks, long body, eats anything | Short perches, cages, no platform tray | Cardinals and jays at the same feeder |
| European Starling | Works suet aggressively, arrives in groups | Bottom access suet cages | Birds that will not cling upside down |
| Mourning Dove | Ground feeder, sits and stays | Sweep the spill, skip ground feeding | Sparrows and juncos that feed low |
| Blue Jay | Heavy, prefers trays and hoppers | Short perches, peanuts offered elsewhere | The jays themselves, if you like them |
| House Sparrow | Resident flocks, uses almost anything | Nyjer and safflower, tight cages | Some finch traffic at first |
Change the Seed Instead of the Feeder
Seed choice does a surprising amount of the work. Cornell notes that sunflower seed with a thick hard shell, particularly striped sunflower, and safflower are both more difficult for blackbirds to open, and Cornell pairs safflower with tray and hopper feeders because those are the shapes cardinals prefer.
Mixes work in the opposite direction. Cheap blends heavy in milo, wheat and cracked corn are exactly what a grackle or dove flock is looking for, and much of it gets kicked to the ground where it feeds even more of them. Our safflower guide and the seed table cover which seed pulls which bird.
What Not to Do
Everything above is exclusion. None of it involves harming a bird, and that line matters both ethically and legally. Trapping, poisoning, sticky products and anything that injures a bird are off the table here, and the rules about which species have legal protection vary by state, so questions about a specific bird belong with your state wildlife agency rather than with a blog.
The other thing not to do is panic. Grackle and blackbird flocks are seasonal and often move through in waves during migration, emptying feeders for a fortnight and then disappearing. Some people simply take the feeders down for a week when a flock settles in, let them lose interest, and put everything back up afterward.
Frequently Asked Questions
How do I keep grackles off my bird feeder? Use short perches and cages and stop offering food on trays or the ground. Project FeederWatch advises avoiding platform trays and not spreading food on the ground, and notes short perches exclude larger birds such as grackles.
What keeps starlings out of a suet feeder? A cage that allows access only from the bottom. Cornell describes these as starling resistant while still letting woodpeckers, nuthatches and chickadees feed by clinging upside down, which is exactly the split you want.
Will safflower keep blackbirds away? It helps. Cornell notes that safflower and striped sunflower have thick hard shells that are more difficult for blackbirds to open, and describes safflower as a cardinal favorite, so you keep the bird you want while thinning the flock.
How do I stop mourning doves taking over? Doves feed mostly on the ground, so the fix is cleanliness rather than hardware. Sweep up spill, remove ground trays, and use feeders that drop less seed. They will still visit, just in smaller numbers.
Is it legal to remove starlings or house sparrows? Protection status differs by species and by state, and this is not something to guess at. Ask your state wildlife agency what applies where you live, and stick to exclusion in the meantime.
Do the flocks ever just leave? Often, yes. Blackbird flocks move seasonally, and a feeder that is overrun in one month can be quiet the next. Taking feeders down for a week is a legitimate reset if a flock has settled in.
The Bottom Line
Big birds get excluded by geometry and by seed, not by force. Short perches and a wire cage handle grackles and jays, a bottom access suet cage handles most starlings, safflower and striped sunflower thin out the blackbirds, and sweeping the ground spill handles the doves. Expect to run two feeders rather than one, because the same short perch that stops a grackle also stops a cardinal. Read next: our caged feeder guide for grid sizes and small bird only feeders for the chickadee side of the yard.