• Berrill, Michael
  • Bertram, Susan
  • Tosswill, Pat
  • Campbell, Victoria


Evidence from a variety of sources, including commercial harvesters, Ministry of Natural Resources census data, and field studies, indicates that Bullfrogs in Ontario are less common now than they were in previous decades, and larger ones are particularly hard to find. Possible explanations for this decline include increased predator pressure, loss of wetland habitats, harvesting, and poaching.


On one night, chorusing males were recorded and compared to the three other populations