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Ministry of Environment

Call Surveys

Great Basin Spadefoot (Spea intermontana)

This technique can be used only to survey frogs and toads, species which vocalize during the breeding season. Citizen Scientist surveyors visit the monitoring site(s) in spring and listen for calling males, recording the species and approximate number of each species heard. This technique is relatively easy, inexpensive, and takes little training.

Questions you can answer with this technique:

  • What species of frog and toad call at this site in any given year?
  • Do the same species breed at the site each year?
  • Approximately how many males are in the breeding population at this site in any given year?
  • When does breeding take place at this site each year and how long does it last? (this last question is very important to monitor climate change induced changes)

Call surveys can be done either at just one site/pond or along a transect (usually a road) stopping at multiple sites to listen for frogs and toads calling. The BC Frogwatch coordinator can help you with site selection, methods and data reporting. Please do not hesitate to call if you are interested in committing to a 3 to 5 year call survey monitoring protocol.


  » Check other survey methods