The breeding wood frogs (Lithobates sylvaticus) are out in numbers at Ross Lake Provincial Park and the ice is off the lake. A friend of the BV Naturalists was out fishing Wednesday March 30 and said the frogs didn’t start singing till 9:00pm and, being Wood Frogs, they turned silent for a few minutes when they heard humans.
For many years Wood Frogs were considered rare because of a dearth of reports, but it was most likely their cryptic (and silent) nature.
To hear a wood frog call, check out the Wikipedia page.