11. Western brown snake, gwardar (Pseudonaja nuchalis)
LD50: 0.473
The gwardar is most common in the western part of Australia, though it is distributed over the whole continent. It is a long (1.5 meters on average) and slender species. They are usually brownish, with freckles or bands over the body and sometimes dark head. They are said to be less aggressive than the eastern brown snake, though their bites can be fatal.