Scientists have captured rare footage of small Southeast Asian snakes escaping danger by performing rapid cartwheels, an unusual form of movement that lets the reptiles travel at speeds of up to 12 feet per second. The findings were published in the journal Current Biology and were reported by Science News and Live Science, based on research by a team from Japan's Toho University working with colleagues in Malaysia.
The behaviour, known as active cartwheeling, has been documented in dwarf reed snakes of the genus Pseudorabdion. Unlike conventional snake movement, which relies on side-to-side undulation along the ground, this escape technique involves the animal briefly lifting parts of its body into the air and rolling forward in a series of rapid rotations. The study offers a closer look at how these small, secretive reptiles coordinate the manoeuvre while keeping their heads relatively stable and maintaining control over the direction they travel.
To study the movement, researchers examined 13 dwarf reed snakes from three Pseudorabdion species, alongside six related reed snakes from the genus Calamaria. They built a narrow track measuring about 2.2 metres and recorded the animals with cameras positioned above and beside it. The footage revealed a carefully coordinated sequence. The snake begins by curling its body into a C shape, lifting its head and pointing it in the direction it intends to move. It then straightens its body and pushes off the ground, briefly lifting part of itself into the air. As it becomes airborne, the snake twists its body into an arch and swings it forward past its head. When the body touches the ground again, the movement sets off another roll. By alternating the side of its body that makes contact, the snake repeats the sequence and keeps moving forward.
Despite these rapid rotations, the researchers found that the head stays relatively stable and aligned with the direction of travel. This control may help the snake keep its bearings and move along a narrow path without losing orientation.
The researchers measured peak forward speeds ranging from 1.72 to 3.69 metres per second, equivalent to roughly 5.6 to 12.1 feet per second, or about 6 to 13 kilometres per hour. The fastest recorded movement was roughly four times the peak forward speed measured when the same snakes travelled using conventional side-to-side undulation. All 13 Pseudorabdion snakes demonstrated the rolling behaviour during the experiments. None of the six Calamaria snakes used the same technique under the test conditions, suggesting that the behaviour may be specific to certain groups rather than a universal ability among small reed snakes.
The findings do not establish that cartwheeling is the fastest or most effective escape method in every situation. The tests measured movement along a controlled track, and researchers still need to determine how the snakes use the technique in their natural habitats.
Dwarf reed snakes are small, secretive reptiles that spend much of their time beneath leaf litter, fallen branches and other ground cover. Their behaviour is consistent with an animal that relies on avoiding danger rather than confronting larger predators. Scientists suspect that sudden, rapid rolling could help the snakes escape threats by startling or confusing a predator long enough for them to reach shelter. Some researchers have also suggested the unusual movement might disrupt scent trails, although that possibility remains unproven.
The behaviour was first formally documented in a 2023 study published in Biotropica, in which researchers described a dwarf reed snake rolling away after being startled during fieldwork in Malaysia. The new study builds on that observation by examining the mechanics of the movement in greater detail. Rolling locomotion is unusual in the animal kingdom but not unique; the Moroccan flic-flac spider, for example, uses a rolling movement to escape threats. The snake study nonetheless offers a rare example of how an animal without limbs can use coordinated body rotations to achieve rapid forward movement.
Open questions remain. Researchers must determine how much energy the movement requires, how long the snakes can sustain it, and whether specific anatomical or neurological features enable the manoeuvre. For now, the findings show that snake locomotion can be more varied than conventional slithering suggests. By coordinating rapid body rotations while stabilising their heads, these small reptiles have developed an unusual way to move quickly when threatened.
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