Sydney has been the site of a number of important studies into frogs, including the earliest studies on their ecology and taxonomy and probably the location of the specimen used for the first description of an Australian frog. At least five species are named from specimens collected in the Sydney region. Clearance of habitat within the region has been severe and many of the original study sites have been lost over time, including the sites of Launcelot Harrison, John Moore and David Woodruff. Loss of sites and species is not only a conservation concern, but leaves some taxonomic problems that may never be solved. Saving the remaining habitats and species in this heavily populated area represents a serious challenge to the current and future generations.