Tiger snakes tell more about local wetlands' pollution levels. Tiger snakes living in Perth's urban wetlands are accumulating toxic heavy metals in their livers, suggesting that their habitats -- critical, local ecosystems -- are contaminated and the species may be suffering as a result. Source 3c.
The tiger snake is not poisonous, but it is still a concern because it can bite with its sharp teeth and cause a serious infection. As it mainly hunts rodents, it is beneficial as a biological control. It also eats squirrels, bats, birds (Adults, chicks and eggs), and the occasional frog and lizard.