You're forgetting something, Eta. A lot of creationists believe that "microevolution," whatever that means, is a reality and that "macroevolution" is what they are arguing against. In this case, they would argue that a vegetarian snake gaining venom to paralyze its prey would be an example of "microevolution."
I was surprised to not see creationists try to pull this argument more often.
The Laminator
For goodness's sake, please vote Democrat this November!