This video from the USA says about itself:
Western Chorus Frog (Pseudacris triseriata) calling in Illinois Beach State Park. There are thousands of this small but very vocal frogs but I had to spend a lot of time to actually see one of them. To record them the secret is to just leave the camera running and move away for 10 minutes.
From Bird Studies Canada:
The Western Chorus Frog is at risk of disappearing from parts of its range in Ontario. Its numbers have declined as much as 40% in some areas since the mid-1990s. Key causes are habitat loss and degradation -through urban sprawl and intensification of agriculture. Diseases, pollution, drainage, and climate change are also factors.