Came across this and thought some of you might find it interesting.
Recording the Sounds of Extinction on Vimeo

Thanks for showing this video, Mark. I do wildlife video on Australia's South-East Coast, and have noticed a considerable decline especially in the bird populations of this region. The missing sounds are, of course, a by-product of this development. Serious bird watchers and the scientific community agree with these findings.

I always enjoyed your tranquil river videos in the past.

Gerd

Thanks for sharing Mark,
This is a real worry for sure. Biodiversity is declining rapidly all over the world.