Topic hub
Problems and Pests
Nearly every feeder problem is misdiagnosed before it is mistreated. Start with the evidence on the ground, then pick the fix that matches the animal.
Most feeder problems are solved backward. People buy a squirrel-proof feeder for a raccoon, or a baffle for a deer, and stay frustrated for a season. Start with the evidence instead. Each culprit leaves a different pattern on the feeder, the pole and the ground beneath.
Work through the table below, confirm the animal, then read the one guide that matches. If you are not sure whether the losses happen at night at all, the first test is free: bring the feeder in at dusk for three nights and see what changes.
Read the symptom, find the culprit#
| What you are seeing | Likely culprit | Read |
|---|---|---|
| Seed gone by morning, lid off or hardware undone | Raccoon | Keeping raccoons off feeders |
| Empty overnight, feeder undamaged, no spill | Flying squirrels or deer | My feeder empties overnight |
| Feeder emptied in daylight, ports chewed wider | Gray squirrel | How to stop squirrels |
| Feeder stripped fast, seed carried off, nothing eaten on site | Chipmunk hoarding | Chipmunks at the feeder |
| Feeder torn down, pole bent, spring through fall | Black bear | Bird feeders and bears |
| Hoof prints, feeder swinging, damage at about 6 ft (1.8 m) | Deer | Deer eating bird seed |
| Droppings, runs and burrows in the spilled seed | Mice or rats | Rodents under bird feeders |
| Sudden total silence, scattered feathers | Hawk hunting the yard | Hawks at your feeder |
| Feathers or kills near a shrub, birds flushing low | Cat | Cats and bird feeders |
| A flock of glossy black birds emptying feeders in minutes | Grackles or blackbirds | Grackles and blackbirds |
| Speckled dark birds mobbing the suet cage | Starlings | Keeping starlings off feeders |
| Small brown birds dominating, nest boxes taken over | House Sparrows | Controlling house sparrows |
| A thud on the glass, or a dust print on the pane | Window strike | Preventing window strikes |
| Seed clumped, crusted or smelling musty | Moisture in the feeder | Moldy, clumped or wet seed |
| Hulls piling up, grass dying beneath the feeder | Spill, not a pest | Seed mess, hulls and dead grass |
| Ants trailing up the hummingbird feeder | Ants, usually via a leak | Ants in a hummingbird feeder |
| Bees or wasps crowding the nectar ports | Insects at nectar | Bees and wasps at feeders |
Read the ground before you buy anything#
The ground under a feeder is the best evidence you have. A neat cone of empty hulls means birds are feeding normally. Whole seed scattered wide means something is raking rather than eating, which is a squirrel or a bird working through filler in a cheap mix. Tracks in mud or snow settle most arguments outright, and a raccoon's five-toed hand print is unmistakable.
Timing narrows it further. Squirrels, chipmunks, jays and blackbirds work in daylight. Raccoons, rats, flying squirrels and deer work after dark. Bears work whenever they like, which is why they get their own rules.
The three-night test
Bring the feeder indoors at dusk and put it back at dawn for three days. If the losses stop entirely, you have a nocturnal animal and the whole problem can often be solved by continuing to do exactly that. If seed still vanishes, the culprit is working in daylight.
What most people get wrong#
Reaching for hardware before geometry. A squirrel-proof feeder hanging from a branch will be defeated; a plain feeder on a smooth pole 5 feet (1.5 m) up and 10 feet (3 m) from any launch point usually is not. Fix the position first, using feeder placement and setup, then decide whether you still need the mechanism.
Trying to out-compete a bird you cannot exclude. Grackles, starlings and House Sparrows do not respond to more seed or a bigger feeder. They respond to a food they dislike and an opening they do not fit through. Switching to safflower, removing millet and cracked corn, and fitting a caged feeder solves more bully-bird cases than anything else.
Three things to never do
Do not grease or oil a pole: it mats feathers and birds cannot insulate themselves afterward. Do not put rodenticide near a feeder: poisoned rodents are eaten by hawks, owls and pets. Do not harass a hawk. Native raptors are federally protected, and trapping, harming or hazing one is an offense.
When the problem is health, not pests#
Some feeder problems are not about animals taking food. A bird that sits fluffed and does not flush, crusted or swollen eyes, or several dead birds in a week are signs of disease spreading at your feeder rather than a pest. The response is the same in every case: take the feeders down, clean thoroughly, rake the spill, and wait two weeks. The full protocol is in cleaning, health and safety.
Where to go next#
Prevention lives in three other sections. Feeder placement fixes the geometry that most pest problems depend on. Bird food and seed fixes the ones that come down to what is in the bag, since millet and cracked corn recruit most of the animals people complain about. And feeder types covers the caged and weight-activated designs that exclude by size when nothing else has worked.
If the real problem is that nothing is showing up rather than too much is, that is the opposite question, and it starts at attracting specific birds.
All 18 guides in this section#
Stopping Squirrels
The 5-7-9 placement rule, correct baffle sizing, safflower and pepper seed assessed honestly, and the popular squirrel deterrents…
Raccoons at Feeders
How to tell a raccoon raid from a squirrel one, the baffle and pole setup that actually stops them, and why bringing feeders in at…
Bears and Feeders
In bear country the honest answer is to take feeders down for the active season. How to judge your risk, read state guidance, and…
Chipmunks at Feeders
Why chipmunks empty a feeder faster than their size suggests, how to baffle them out, and what to do about burrows under a patio or…
Mice and Rats
How to tell rats from mice under a feeder, cut the spill that feeds them, choose hull-free seed, and decide when a feeder has to…
Deer at Feeders
Why deer clean out feeders at dusk, the height and exclusion numbers that work, seed choices they dislike, and why feeding deer is…
Cats and Feeders
How far a feeder needs to be from cover a cat can hide in, why bells only partly work, and what to do about a neighbor's cat…
Hawks at the Feeder
How to identify Cooper's and sharp-shinned hawks at a feeder, why they are protected by law, the escape cover that helps, and when…
Ants in Nectar Feeders
Why a water-filled ant moat solves the problem, how to find the drip that attracted the ants, and why oil and insecticide near a…
Bees and Wasps
Saucer feeders, bee guards, the nectar ratio you should never weaken, and why moving a feeder a few feet often ends an insect…
Window Strikes
Why birds hit glass, the 2-inch marker spacing rule, which outside treatments work, and the feeder distances that make collisions…
Feeder Empties Overnight
How to tell squirrels, deer, raccoons, rodents and simple seed leaks apart when a full feeder is empty by morning, and the fix for…
House Sparrows
House sparrows are not federally protected in the US, but exclusion beats everything else: seed swaps, feeder choice and nest box…
Starlings
Upside-down suet feeders are the one measure that reliably stops starlings. Here is how they work, plus cage grids, safflower and…
Grackles and Blackbirds
Grackles, blackbirds and cowbirds are native and protected, so the answer is exclusion: short perches, safflower, cages, no trays…
Seed Mess and Hulls
Sunflower hulls suppress plant growth, which is why the lawn dies under a feeder. Catch trays, hull-free seed and rotation fix it…
Moldy and Wet Seed
Moldy seed can carry aflatoxin, which kills birds. Bin it, never compost it, and fix the two causes: a feeder that lets water in…
Neighbors and Ordinances
How to find out whether feeding birds is restricted where you live, when a restriction is legitimate, and what to change first when a neighbor complains.
Frequently asked questions#
What is emptying my bird feeder overnight?
Raccoons, deer, flying squirrels or rats, in roughly that order. Raccoons undo hardware and leave the lid open or the feeder on the ground. Deer take the whole feeder in one mouthful and leave hoof prints. Flying squirrels leave no damage at all. The universal test is to bring the feeder in at dusk for three nights and see whether the losses stop.
How do I stop squirrels getting on my bird feeder?
Geometry first: a smooth pole with the feeder base 5 feet (1.5 m) up, 10 feet (3 m) from any fence, rail, trunk or roof, with a correctly sized baffle whose top sits 4 to 5 feet (1.2 to 1.5 m) off the ground. Hardware and safflower seed are second and third. Never grease a pole, because oil ruins feathers and can be fatal to birds.
Why did all the birds suddenly disappear from my feeder?
A hawk, a cat, or natural food abundance. A sudden total silence with scattered feathers under the feeder usually means a Cooper's or sharp-shinned hawk is hunting the yard. Birds return within a few days to two weeks. In late summer and fall they also disperse simply because wild seed is everywhere.
How do I keep starlings and grackles off my feeders?
Change what you offer and how they can reach it. Safflower, nyjer and straight sunflower in the shell suit them poorly, while cracked corn, peanuts and mixes with millet pull them in. A caged feeder with a 1.5 inch (4 cm) grid, or a tube with perches under about an inch, excludes both while letting chickadees, finches and nuthatches through.
Is it safe to use poison or grease around a bird feeder?
No. Rodenticide moves up the food chain into hawks, owls, foxes and pets, and it is a documented cause of secondary poisoning. Petroleum jelly, oil and sticky products mat feathers so a bird cannot insulate or waterproof itself, which is often fatal. Every genuine fix in this section works without either.
What should I do if I see a sick bird at my feeder?
Take the feeders down for at least two weeks, scrub everything with hot soapy water and a dilute bleach solution, dry it fully, and rake up the spilled seed underneath. Sick birds at feeders usually mean salmonellosis or finch eye disease, both of which spread at crowded feeding surfaces.