When we think about animals that fly or glide, we usually picture wings attached to arms. Birds flap feathered forelimbs. Bats use stretched skin between elongated fingers. Even extinct pterosaurs relied mainly on giant arm-supported wings.
But one prehistoric reptile broke all the rules.
Meet Sharovipteryx, a tiny creature from around 220 million years ago that appears to have glided using enormous skin membranes attached to its hind legs.
It may be one of the weirdest experiments nature ever attempted.
What Was Sharovipteryx?
Sharovipteryx was a small reptile discovered in what is now Kyrgyzstan. It lived during the Late Triassic period, long before birds evolved and before the skies were dominated by giant pterosaurs.
The fossil was first described in the 1970s by palaeontologist Alexander Sharov, which is where the animal gets its name.
The creature itself was tiny, roughly the size of a modern pigeon or small squirrel. Yet despite its modest size, its body design was extraordinary.
Its back legs were incredibly long compared with the rest of its body. Skin membranes stretched from these legs to the tail, forming what looked like a giant delta wing.
Its front limbs were tiny by comparison.
In simple terms, Sharovipteryx seems to have flown backwards compared with almost every other flying animal.
How Did It Fly Using Its Legs?
Scientists believe Sharovipteryx was probably a glider rather than a powered flier.
Instead of flapping like a bird, it likely launched itself from trees and used its hind-leg wing membrane to glide between branches.
The design may have worked a bit like a hang glider or dart.
Its large rear wing would have generated lift while the small front limbs possibly acted as stabilisers or steering surfaces.
Some researchers think the animal may have held its front limbs outward during glides to help control pitch and direction.
Others believe it could have adjusted the tension in its leg membranes to steer.
No living animal glides in exactly the same way today, although flying squirrels and colugos come closest in principle.
Sharovipteryx remains unique because its main wing surface was behind its centre of gravity, not in front.
That sounds unstable, and in many ways it probably was. Yet evolution clearly thought it was worth trying.
Nature has always been wonderfully experimental.
A Living Paper Aeroplane
One reason Sharovipteryx fascinates scientists is because its body resembles modern aerodynamic concepts.
The triangular rear wing resembles the shape of stealth aircraft and delta-wing jets.
Some aerodynamic studies have suggested the design may actually have been surprisingly stable at certain glide angles.
Its long tail may also have acted like the stabilising tail of an aircraft.
This is a reminder that evolution often discovers engineering solutions long before humans do.
That idea lies at the heart of biomimicry, where scientists study nature to inspire human inventions.
If Sharovipteryx had such an unusual flight system, why do we not see it today?
The honest answer is that we do not fully know.
Its design may simply have been less efficient than arm-based wings. Rear-mounted gliding membranes could have limited manoeuvrability or made take-offs difficult.
Evolution tends to favour designs that can adapt and improve over time. Forelimb wings eventually led to birds, bats, and pterosaurs dominating the skies.
There are several likely disadvantages:
Difficult take-offs.
Launching into the air may have been awkward because the main lifting surface was behind the body.
Limited manoeuvrability
Front-wing designs allow quicker steering and better balance.
Poor powered flight potential
Leg membranes work for gliding, but evolving flapping flight from hind limbs is mechanically difficult. Front limbs are simply better suited for muscles, control and lift generation.
Problems on the ground
Huge membranes attached to the legs may have made running and climbing awkward.
Competition
Early pterosaurs were already evolving far more effective wing systems using elongated fingers and powerful chest muscles.
Sharovipteryx may represent one fascinating evolutionary side road that ultimately reached a dead end.
Still, what a brilliant side road it was.
Could Sharovipteryx Inspire Modern Technology?
Possibly.
Scientists studying gliding animals often look at unusual body shapes to inspire new aircraft, drones, and parachute systems.
Sharovipteryx shows that stable gliding can potentially happen in ways engineers might not first expect.
Nature rarely sticks to one solution.
That is one reason extinct creatures remain so important. Every fossil preserves not just a skeleton, but an idea tested by evolution itself.
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About the creators:
Steve Punt is a writer and broadcaster, known for his work across BBC radio and television, and co-creator of Rockford’s Rock Opera.
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