Cats have long been known for their ability to land on their feet, but the precise mechanics behind that mid-air twist have eluded scientists for more than a century. New research points to a specific structural advantage: an exceptionally flexible section of the feline spine.
A team led by Yasuo Higurashi at Yamaguchi University in Japan examined the spines of five deceased cats, physically twisting different spinal regions to measure their range of motion. The thoracic spine, located in the middle of the back, rotated three times more than the lumbar spine in the lower back. That gap in flexibility appears to be central to how cats right themselves during a fall.
Three Competing Theories
Scientists have debated three main explanations for the “righting reflex” since at least the 19th century. The first involves the tail acting as a propeller, spinning one way to rotate the body the other. This theory has largely fallen out of favor, since tailless cats can still land on their feet.
The second model, known as the bend-and-twist, proposes that the cat folds its body nearly into a right angle and simultaneously rotates its front and rear halves in opposite directions, so all four legs arrive at the correct position at the same time.
The third, the tuck-and-turn, works in sequence: the cat tucks its front legs in while extending its rear legs and rotates its front half first, then swaps the leg positions and rotates the rear half. Front and back orient correctly at different moments.
What the High-Speed Video Showed
To test these theories against actual cat behavior, Higurashi’s team dropped two adult cats from a height of 1 metre and recorded the falls on high-speed video. In both animals, the front half finished rotating tens of milliseconds before the rear.
That timing supports the tuck-and-turn model more than researchers previously assumed. Greg Gbur, a physicist at the University of North Carolina at Charlotte and author of Falling Felines and Fundamental Physics, said the new findings shifted his thinking. “My general impression has been that the bend-and-twist is the most important, but this paper actually makes me reassess a bit and give a little bit more credence to the tuck-and-turn,” he said.
Gbur was careful not to declare one model the winner. “Physicists in particular love to look for simple models of how things work, whereas nature tends to look for the most effective method, which may not be simple,” he said. “Cats are complicated creatures doing complicated motions.”
An Unexplained Directional Preference
The study also produced an unexpected detail. Both cats in the live experiments rotated to the right during their falls. One did so every single time; the other turned right in six out of eight trials.
Gbur noted that cats in his own video archive appear to share this tendency. “It looks like, at least anecdotally, cats seem to have a rough preference for which way they twist,” he said. One possible explanation is that asymmetries in the placement of internal organs make rotating in one direction physically easier, though no firm conclusion has been drawn.
The research was published in The Anatomical Record (DOI: 10.1002/ar.70165).
Photo by Viktor SOLOMONIK on Unsplash
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