Ancient Archaeopteryx Likely Took Flight Through Multiple Powerful Leaps

For more than a century, paleontologists have puzzled over a fundamental question: how did Archaeopteryx, a creature caught between dinosaur and bird, manage to get itself off the ground? The animal, which lived 150 million years ago, possessed wings and feathers but lacked the anatomical equipment that modern birds take for granted. Its shoulder joints couldn't lift its wings high enough. Its breastbone—the keeled sternum that powers a bird's explosive launch—simply wasn't there. Yet somehow this hybrid creature became airborne. New research from the University of Southampton suggests the answer was far simpler than scientists had imagined: Archaeopteryx didn't leap once. It leaped two or three times.

Archaeopteryx occupies a singular place in evolutionary history. It was, as paleobiologist Neil Gostling describes it, "the first real bird"—covered in feathers, equipped with wings, yet clinging to distinctly dinosaurian traits. Its skeleton bore a long bony tail, claws on separate fingers, and teeth set in a jaw without a beak. It was, in other words, a creature in transition, and that transition created a mechanical problem. The wings that would eventually define avian flight were too weak to generate the force needed for takeoff on their own. The shoulder that would eventually rotate and power a modern bird's launch was too restricted. Something else had to do the work.

That something was the legs. Biomechanics professor Markus Heller explains the insight plainly: "We know Archaeopteryx couldn't rely on its wings to take off—with no keeled sternum, and a shoulder that couldn't lift the wing above the back—so we asked what its legs could contribute. It turns out that is where take-off is won: the legs generate the force, and the wings take over afterwards." The research team, led by Erik Meilak and including Pauline Provini from the Muséum National d'Histoire Naturelle in Paris, built their analysis on observations of living birds—crows, magpies, gulls, finches—and adapted those measurements to Archaeopteryx's known anatomy. Using computer modeling, they calculated the forces at the hip, knee, and ankle, estimating the animal's muscle capacity and launch speed.

The results were striking. A 400-gram Archaeopteryx could have reached the minimum speed for sustained flight—seven meters per second—using just three bipedal leaps. Alternatively, it could have managed the feat with two leaps separated by a downward flap of its wings. This multi-leap strategy, it turns out, was not merely possible; it was energetically efficient. Modern birds still employ it. Crows, magpies, and seagulls regularly use multiple hops to launch themselves, particularly when they're not in immediate danger. A startled bird may explode upward in a single bound, but a bird conserving energy—much like an ancestor—will use two, three, or more successive pushes from the ground.

Gostling notes that even in contemporary birds, the legs do most of the work. Up to 90 percent of the force required to leave the ground comes from the legs; the wings take over once the animal is airborne. For Archaeopteryx, the sequence would have looked something like this: a leap, another leap, perhaps a third, with vigorous flapping interspersed, until the wings caught enough air to sustain flight. It was not the graceful, instantaneous launch of a modern songbird, but it was effective. And it solved a puzzle that had confounded science for generations—not through some exotic mechanism, but through a strategy that birds still use today, a ghost of their ancient past written into their present behavior.