Tiliqua rugosa are quite common in Australia and do not suffer from many natural predators. Road side killings tend to be the most devastating force on wild populations. A study of percent population loss of this species due to road kill was conducted and the results showed an average annual 11.9% population loss. These results greatly contrasted with an estimate by Ehmann and Cogger (1985) that 0.014% of all mortality in Australian herpetofauna is dure to road kills. This suggests that T. rugosa is very susceptible to this form of mortality, probably due to their feeding habits outlined above.