Ep. 244 : The Call of the Northern Green Frog

For the past few years I have been going out at night in May to record the calls of American Toads and Northern Leopard Frogs by the Eramosa River. I used to live much closer to the river and I could hear the songs from my window at night. When I heard those songs, I knew it was time to go record, and that the radio show that week was going to be the calls of the Anurans.
The problem was that lately, it has been pretty quiet on the home front. Maybe it was a bit too chilly for the Anurans to sing, or the rain has prevented me from bringing my recorders out, lest they get destroyed. But there have also been some really good nights, quite suitable for toad and frog song, but still it was quiet but for the Canada Geese. What was going on?