The Broad-Headed Snake is a small to medium sized species of venomous snake. Fully-grown snakes attain an average maximum length of 60 cm although some records show that they can grow as large as 90 cm. They are black with numerous irregular yellow markings arranged in narrow cross-bands, which for inexperienced people can easily lead to confusion with young Diamond Pythons which are superficially very similar and found in the same habitat.