The classic riddle answer is “time,” because time flies but has no wings. But if you’re curious about what literally travels through the air without wings, the natural world is full of surprising examples. Animals, plants, and even human-engineered vehicles achieve flight or sustained gliding using creative alternatives to wings.
The Riddle Answer: Time
“What flies without wings?” is one of the oldest riddles in English. The traditional answer is time, playing on the phrase “time flies.” Other popular answers include “an arrow,” “the wind,” “a cloud,” and “your imagination.” These all work because the riddle hinges on the double meaning of “flies.”
Animals That Glide Without Wings
Several animals have evolved ways to travel through the air without anything resembling a bird’s or insect’s wing. Flying squirrels, colugos, and sugar gliders all use a patagium, a membrane of skin stretched between their front and hind limbs. This structure generates lift and allows them to steer mid-air. The Malayan colugo holds the record among gliding mammals, covering distances up to 150 meters in a single glide.
Flying fish launch themselves out of the water at speeds over 35 miles per hour, then spread rigid, elongated pectoral fins to glide up to 650 feet (200 meters) across the ocean surface. Their fins don’t flap. They function like fixed airplane wings, riding the air cushion above the waves.
Perhaps the strangest example is the flying snake. Species in the genus Chrysopelea leap from tree branches and flatten their entire body by splaying their ribs outward. This transforms their normally round cross-section into a triangular shape with a concave underside, essentially turning the snake’s body into an airfoil. That concave belly traps a zone of high pressure beneath the snake, generating surprisingly large lift. The snake also undulates in the air, producing a glider with no bilateral symmetry, unlike any other known flyer, biological or engineered.
Spiders Riding Electricity and Wind
Spiders don’t have wings, yet they’ve been collected from airplane wing traps at altitudes of 15,000 feet. They get there through “ballooning,” a technique where a spider climbs to a high point, releases threads of silk into the air, and lifts off. For years, scientists assumed wind drag alone carried them. But recent experiments showed that Earth’s atmospheric electric field can also pull spiders upward, even in still air. Exposure to an electric field alone was enough to trigger spiders’ pre-launch behaviors (standing on tiptoe and dangling) and physically lift them off the ground. The real mechanism is likely a combination of both aerodynamic drag and electrical force, which explains how spiders can balloon on calm days when wind alone shouldn’t be sufficient.
Seeds Built for Air Travel
Dandelion seeds are remarkably effective flyers, and in 2018, researchers published in Nature discovered why. The bristly tuft on top of each seed (the pappus) doesn’t work like a parachute. Instead, air flowing through the gaps between bristles creates a stable, detached vortex ring, a donut of recirculating air that sits just above the pappus. This vortex generates steady drag that keeps the seed aloft far longer than a solid disk of the same size could. The spacing of the bristles turns out to be precisely tuned: porous enough to form the vortex, dense enough to maximize air resistance, and minimal enough to keep the structure lightweight. Researchers confirmed this by building microfabricated disks with matching porosity, which reproduced the same airflow pattern.
Maple seeds take a different approach. Their single blade spins as it falls, autorotating like a tiny helicopter. This spinning generates lift that slows the descent dramatically, giving wind more time to carry the seed away from the parent tree. The system is remarkably tough. Even when hit by high-speed raindrops that pitch the seed up to 60 degrees off axis, a maple samara recovers stable autorotation in less than 50 milliseconds. It can even maintain spinning at more than double its original weight.
Machines That Fly Without Wings
Engineers have built aircraft that generate all of their lift from the shape of the fuselage rather than from attached wings. These are called lifting bodies, and NASA and the U.S. Air Force tested several during the 1960s and 1970s. A lifting body’s rounded, contoured shape creates pressure differences across its surface, the same basic physics that makes wings work, just applied to the vehicle’s body. Lifting bodies were developed for spacecraft reentry because they have greater internal volume than winged designs and avoid the extreme heating penalty that wings create at hypersonic speeds. They could be controlled from Mach 25 all the way down to landing speed.
Rockets are the most obvious wingless flyers. They don’t rely on aerodynamic lift at all. Instead, they use thrust, the force generated by expelling exhaust at high speed, to push directly against gravity. A rocket’s thrust-to-weight ratio simply needs to exceed 1.0 for the vehicle to climb. This is why rockets can operate in the vacuum of space where wings and air-based lift are useless. The tradeoff is fuel: achieving orbit requires enormous velocity (roughly 17,500 mph for low Earth orbit), and every pound of fuel adds weight that demands still more fuel to lift.
Why So Many Things Fly Without Wings
Wings are just one solution to the problem of moving through air. The alternatives, whether a snake’s flattened ribcage, a spider’s electrified silk, or a seed’s porous bristle disk, all manipulate the same underlying physics: pressure differences, drag, and in the spider’s case, electrostatic force. The variety of wingless flight in nature suggests that whenever there’s an ecological advantage to getting airborne, evolution finds a way, wings optional.