This research was partially supported by Defense Advanced Research Projects Agency (DARPA) grant W911NF1010040 to J.J.S. and P.P.V.
I guess it turns out it wasn’t a secret.
Holden, Daniel, John J. Socha, Nicholas D. Cardwell, and Pavlos P. Vlachos. “Aerodynamics of the flying snake Chrysopelea paradisi: how a bluff body cross-sectional shape contributes to gliding performance.” Journal of Experimental Biology. (217):382-394. (available February 1, 2014)