SummaryBamford, A.R., Davies, S.J.J.F.&van Delft, R. (1990). The effects of model power boats on waterbirds at Herdsman Lake, Perth, Western Australia.Emu90, 260–265.The study shows that the use by waterbirds of those parts of Herdsman Lake used for racing model power boats remained at a level comparable with that of other parts of Herdsman Lake. We consider that the racing of model power boats, at its present levels of intensity and frequency, is not detrimental to waterbirds in the long term. On days when model boats