Scientists have captured footage of "flying" snakes, explaining how five related snake species stay airborne for up to 79 feet.
The acrobatic arboreal snakes, all in the genus Chrysopelea, use what's known as gliding flight to sail from tree to tree in their Southeast and South Asia habitats.
The new research, presented today at the American Physical Society Division of Fluid Dynamics meeting in Long Beach, explains how the snakes accomplish their seemingly improbable feat.
"The snake isn't defying gravity or doing something out of the blue," project leader Jake Socha told Discovery News. "It's the magnitude of the forces that are somewhat surprising. Given that this is a snake, and its cross-sectional body shape is more like a blunt shape than a typical streamlined wing, we wouldn't have expected such good aerodynamic performance."
Socha, a Virginia Tech biologist, and his team launched the flying snakes from an over 49 foot tower and recorded the snakes' every move to the finest detail.
The scientists, whose work has been accepted for publication in the journal Bioinspiration & Biomimetics, next developed a mathematical model to explain how the snakes use gliding flight to travel over such long distances.
"The snake creates lift using a combination of its flattened cross-sectional shape and the angle that it takes to the oncoming airflow, known as the angle of attack," Socha explained.
To take off from a tree branch, for example, these snakes will drop the front of their bodies to create a "J"-shaped loop before jumping and accelerating upwards. That motion hurls the snake into the air.
The researchers determined that the airborne snakes never reach an "equilibrium gliding" state, when the forces generated by the snakes' undulating bodies exactly counteract the force pulling the animals down. The snakes did not just immediately fall to the ground either.
Instead, "the snake is pushed upward -- even though it is moving downward -- because the upward component of the aerodynamic force is greater than the snake's weight," Socha said.
"Hypothetically, this means that if the snake continued on like this, it would eventually be moving upward in the air -- quite an impressive feat for a snake," he added. "But our modeling suggests that the effect is only temporary, and eventually the snake hits the ground to end the glide."
Read more at Discovery News
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