Reviewed by William "Willy" Vizcarrondo, NYS DEC Certified Commercial Pesticide Applicator C1825832. Updated September 23, 2026.
Short answer
Termites probably swarmed inside your house. Winged termites shed their wings within hours of flying, so a pile of identical, clear wings on a sill, in a light fixture or in a spider web is what a swarm leaves behind. Swarmers that emerge indoors almost always mean an active colony in the structure, so the next step is an inspection.
All four wings the same size. A termite has two pairs of wings of roughly equal length, and the EPA's identification guide contrasts that with ants, whose front wings are longer than the back wings. Termite wings are also clear to smoky and easily twice the length of the body, and they break off cleanly at the base, which is why you find whole wings and no insects. If you can find one of the wingless bodies nearby, Penn State's test settles it: an ant has a narrow, wasp-like waist and elbowed antennae; a termite has a broad waist and straight antennae.
Because swarmers fly toward light. When a colony under or in the house releases its winged reproductives, they come up through a crack in the slab, a gap at a door sill, the joint where a wall meets the floor or a plumbing penetration, and head for the brightest thing in the room, which is the window. They can't get out, they drop their wings, and they die or crawl away within a day. University of Kentucky's extension notes that winged termites emerging indoors are incapable of damaging wood and only live about a day, but that their presence almost always indicates an infestation warranting treatment. The wings are harmless; what produced them is not.
Save the evidence and book an inspection. Tape a few wings to an index card or drop them in a bag, note which window and which room, and look for the exit hole, which is often a tiny gap at the base of the wall or around the window frame below the sill. Then check the basement or crawlspace walls, sill plate and the posts under the house for mud tubes, the earth-colored runways Penn State describes on cellar walls, posts and mudsills. Even if you find nothing else, the wings are enough to warrant a professional inspection, and the sooner it happens the smaller the treatment tends to be.
The windowsill call comes in April and May, and the wings are usually in a basement window well, a first-floor bedroom window or a bathroom on a slab. In the Levittown and Hicksville capes and ranches with slab floors, the swarm comes up through the slab joint under the radiator or at the tub; in the Huntington and Smithtown colonials with basements it's the sill plate or a basement window frame. We photograph the exit point, probe the wood around it, and check the whole perimeter before writing anything up.
Related
Yes, and it's worth checking. Ant wings come in two sizes on the same insect, front longer than back, and ants that swarm indoors in spring are usually carpenter ants, which is its own problem. If every wing in the pile is the same size and shape, they're termite wings.
Yes. The swarmers you didn't find are dead or gone, but they came from a colony of workers that is still feeding, and the workers are what damage wood. Swarmers are the one visible event in a year of hidden activity.
Get an inspection first. One swarm inside the house is strong evidence of an active colony, and an inspection will look for mud tubes, damaged wood and moisture to confirm where it is. If the inspection finds activity, treating sooner is cheaper than waiting for the next swarm.
Still not sure? Call (516) 509-6001 and we'll tell you what you're dealing with.