Patrick T. Gregory and Linda A. Gregory
We thank the editors for inviting us to contribute to this volume. Bill Leonard, Chris Shewchuk, and Paul Fisher kindly allowed us to use their photographs. Bruce Treichel informed us about the status of species in Alberta. David Green provided us with a copy of his annotated taxonomic catalogue of amphibians of British Columbia. Finally, PTG thanks the Natural Sciences and Engineering Research Council of Canada for supporting his field studies, which provide the background for much of this chapter.