This was based on "Fangs", a script John Carpenter did back in the 1970s when he wrote as a gun for hire. In the original, according to Carpenter himself, there were scares and jumps all over the place. One scene included a man who hears a rattle, thinks it's his infant, and finds a rattlesnake in the crib.
The shooting title for the movie was "Diamondback", but subsequently changed to "Silent Predators" for release.