Plains cottonwood (Populus sargentii) grows near water, and tends to mimic water in several ways. Visually their leaves ripple in the wind like water rippling on a fairly still pond. The sound of the wind through their leaves also mimics water flowing in a stream. I recorded a gentle wind passing through a small grove of cottonwoods near a swamp full of cattails, birds, insects and amphibians. My wind sock for the PCM-D50 didn’t provide all the wind noise protection I would have liked, but I got a good few seconds out of it anyway.