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Flying snakes, caught on camera

Date:
November 23, 2010
Source:
American Institute of Physics
Summary:
New video analysis and mathematical modeling by engineers reveals how certain types of snakes can "fly" by flinging themselves off their perches, flattening their bodies, and sailing from tree to tree.

This is the flying snake Chrysopelea paradisi.
Credit: Copyright Jake Socha.

Five related species of tree-dwelling snakes found in Southeast and South Asia may just be the worst nightmares of ophidiophobes (people who have abnormal fears of snakes). Not only are they snakes, but they can "fly" -- flinging themselves off their perches, flattening their bodies, and gliding from tree to tree or to the ground.

To Virginia Tech biologist Jake Socha, these curious reptiles are something of a biomechanical wonder. In order to understand how they do what they do, Socha and his colleagues recently studied Chrysopelea paradisi snakes as they launched themselves off a branch at the top of a 15-meter-tall tower.

Four cameras recorded the curious snakes as they glided. This allowed them to create and analyze 3-D reconstructions of the animals' body positions during flight -- work that Socha recently presented at the American Physical Society Division of Fluid Dynamics (DFD) meeting in Long Beach, CA.

The reconstructions were coupled with an analytical model of gliding dynamics and the forces acting on the snakes' bodies. The analyses revealed that the reptiles, despite traveling up to 24 meters from the launch platform, never achieved an "equilibrium gliding" state -- one in which the forces generated by their undulating bodies exactly counteract the force pulling the animals down, causing them to move with constant velocity, at a constant angle from the horizon. Nor did the snakes simply drop to the ground.

Instead, Socha says, "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."

"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 says. But our modeling suggests that the effect is only temporary, and eventually "the snake hits the ground to end the glide."

The presentation, "Gliding flight in snakes: non-equilibrium trajectory dynamics and kinematics" was given on November 22, 2010

This research is being published in the journal Bioinspiration and Biomimetics.


Story Source:

The above story is based on materials provided by American Institute of Physics. Note: Materials may be edited for content and length.


Journal Reference:

  1. John J Socha, Kevin Miklasz, Farid Jafari and Pavlos P Vlachos. Non-equilibrium trajectory dynamics and the kinematics of gliding in a flying snake. Bioinspiration and Biomimetics, 24 November 2010 [link]

Cite This Page:

American Institute of Physics. "Flying snakes, caught on camera." ScienceDaily. ScienceDaily, 23 November 2010. <www.sciencedaily.com/releases/2010/11/101122200555.htm>.
American Institute of Physics. (2010, November 23). Flying snakes, caught on camera. ScienceDaily. Retrieved October 21, 2014 from www.sciencedaily.com/releases/2010/11/101122200555.htm
American Institute of Physics. "Flying snakes, caught on camera." ScienceDaily. www.sciencedaily.com/releases/2010/11/101122200555.htm (accessed October 21, 2014).

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