Michael V said:

Peak Warming Man said:

Michael V said:

Have neither seen nor heard any here. But we have several different owls that I hear at times.

The Tawnys make a hissing sound if I recall correctly.

I have not heard that from a Tawny Frogmouth. The sound I’ve heard was very quiet, but I forget how to describe it.

Several recordings at Graham Chapman’s site, link