Not a snake it's a caterpillar

[dustyduck]

Some interesting caterpillars

http://www.grindtv.com/outdoor/nature/post/caterpillar-appears-snake-camouflage/

[SoCalGal]

 
Man, that guy is pretty brave in my book - if he goes deliberately looking for caterpillars in Costa Rica and tells us that "Every caterpillar in Costa Rica looks like something else, be it a leaf, twig, or in this case, a slithering snake."  But fascinating stuff, thanks for posting!