You can also check if it's venemous by checking how long its fangs are. Constrictors have a lot of small short teeth for holding onto prey. Venemous snakes have at least 2 large fangs for injecting venom. Therefor if a snake has big teeth then it's either venomous or a very large constrictor. So next time you're wondering if a snake is dangerous just take a good close look at it's teeth to find out.