Any snake can go in a hole. But rule of thumb is if the head has a diamond shape it is poison, if the head is oval it is not. If you have alot of pinestraw in flower beds watch out, good for hiding snakes. We just got into it with my ex-son-in-law about snakes. He caught a knig snake and was letting my grandkids age 4 and 3 touch it. he said he explained about good and bad snakes. But how many little ones like these kids can tell the difference between good and bad snakes. What an idiot.