Is that a young rattle snake? Interesting thing with rattlers is that you can drink their poison and it won't harm you (just like it doesn't harm them when they eat their poisoned prey) unless you have an ulcer in which case it gets into your blood system and is not digested harmlessly. Similarly, if a snake has stomach bleeding it will die from its own poison if swallowing it.
I knew of the tequila with worms in it, always thought that was to evidence quality of the alcohol content as the worm would be preserved. And of course eaten by Willem Dafoe in that "Born 4th of July" scene ...