Squirrel droppings are small, dark pellets about 3/8 inch long and 1/8 inch wide, roughly the size and shape of a raisin or coffee bean. They have rounded edges, sometimes with a slight taper at one end and a bulge in the middle. If you’ve found mystery droppings in your attic, along a deck railing, or near a bird feeder, here’s how to confirm they belong to a squirrel and what to do next.
Size, Shape, and Color
Each pellet is slightly smaller than a dry grain of rice but thicker. Picture a dark, plump oval, not the thin, pointed shape you’d see from a mouse. The edges are smooth and rounded rather than angular or jagged.
Color shifts as the droppings age. Fresh squirrel poop is dark brown and slightly moist-looking. Over the next few days it dries out, lightening to reddish-brown, tan, or occasionally greenish. That color variation comes from squirrels’ plant-heavy diet. A squirrel that’s been eating berries, acorns, bark, and garden vegetables will leave droppings that shift in shade more than you’d expect from a rat or mouse, which eat a narrower range of foods.
You’ll typically find them in small, scattered piles of fewer than a dozen pellets. Squirrels tend to return to the same spots, so droppings accumulate in consistent locations rather than being spread randomly across a surface.
Squirrel Poop vs. Rat Poop
This is the comparison most people actually need to make, because these two get confused constantly. Rat droppings are noticeably larger, about 1/2 to 3/4 inch long, darker, and more uniform in shape. If you lined them up, a rat pellet would be roughly twice the length of a squirrel pellet. Rat droppings also tend to look more consistent from piece to piece, while squirrel droppings vary slightly in size and shade within the same pile.
Location and pattern help, too. Rats leave droppings in tight clusters, often along walls and baseboards where they travel. Squirrels leave smaller, looser piles near corners, along attic beams, or close to their nest. If you’re finding pellets tucked into attic insulation or near a chewed-open roof vent, squirrels are the more likely culprit.
Squirrel Poop vs. Mouse and Bat Droppings
Mouse droppings are smaller than squirrel droppings and pointed at both ends, like tiny dark grains of rice. Squirrel pellets are rounder and thicker by comparison. If what you’re finding looks like small, tapered spindles, think mice.
Bat guano can look similar in size to squirrel droppings, but there’s a simple test: crush one. Bat guano crumbles easily into a powdery substance that sparkles under light because it’s made almost entirely of undigested insect shells. Squirrel droppings (and all rodent droppings) are hard and dense. A dry squirrel pellet resists pressure and eventually breaks into hard fragments rather than crumbling into powder. If you see that glittery, powdery texture, you have bats, not squirrels.
Flying squirrels deserve a separate mention. Their droppings are more rounded or oblong and look like small black pellets. The giveaway is their bathroom habits: flying squirrels use a communal latrine, creating distinct concentrated piles in one or two spots in an attic, rather than the scattered piles that gray and red squirrels leave.
Where Squirrel Droppings Show Up
Squirrels don’t poop randomly. They return to the same places, usually close to wherever they’re nesting or entering a structure. The most common spots are attic corners, on top of or inside insulation, along roof edges, on decks, and under porches. If you’re seeing droppings accumulate in one or two consistent areas of your attic, that’s a strong sign of an active squirrel presence rather than a one-time visit.
Other signs that confirm a squirrel problem alongside the droppings: chewed wood or wiring near the roofline, gnaw marks on fascia boards or soffit vents, scratching or scurrying sounds (especially in early morning), and nesting material like shredded insulation or leaves gathered into a ball.
Health Risks From Squirrel Droppings
Squirrel feces can carry salmonella bacteria, which people typically pick up while cleaning or disturbing areas where squirrels have been active. Leptospirosis is another concern, spread through contact with urine from infected animals or contaminated surfaces in spaces where squirrels have been nesting. While hantavirus is primarily associated with mice and rats, squirrels are rodents too, so treating their droppings with the same caution is reasonable.
The practical takeaway: don’t handle squirrel droppings with bare hands, and don’t sweep or vacuum them dry. Both of those actions can send bacteria and virus-carrying particles into the air you’re breathing.
How to Clean Up Safely
Start by ventilating the space. Open all doors and windows for at least 30 minutes before you begin, and leave the area entirely during that time. This is especially important in enclosed spaces like attics, sheds, or crawlspaces where airborne particles concentrate.
Put on rubber or plastic gloves, then spray the droppings thoroughly with a household disinfectant (check that the label actually says “disinfectant”) or a bleach solution of 1.5 cups of household bleach per gallon of water. Soak the droppings until they’re visibly wet and let the solution sit for at least five minutes. This contact time is what kills bacteria and viruses.
After soaking, wipe everything up with paper towels and throw them in a covered trash can. Then mop or sponge the entire surrounding surface with disinfectant. Wash your gloved hands with soap and water before removing the gloves, then wash your bare hands again with soap and warm water.
The most important rule: never sweep or vacuum squirrel droppings dry. A broom or vacuum launches contaminated dust particles into the air, which is the primary way people get exposed to rodent-borne pathogens during cleanup. Always wet the droppings with disinfectant first.