Ah, the wonders of nature. She's full of surprises, and so many musical ones.
This really is a lovely thread. I'm staying on a farm at the moment, and while I'm literally surrounded by synths, it's so easy here to re-tune to the sounds of nature, even as I sit staring at the laptop. So many bird calls (we had three hawks trying to get at the chickens a couple days ago), and the various leaves falling from various trees. We used the sound of falling apples on a track a while back (the song was called "The Apples Are Falling," but the apples were of course dropped)...
All that said, as I prep to fly back to Berlin tomorrow, one of my first and favorite memories of living in Berlin was the "sound" of the silence after the first heavy snowfall. As a California boy, hearing the sudden soft soundlessness of Sanderstrasse covered in 6 inches of snow was startling.
Tying things together in a DSI-friendly way, I'll be reunited with my Prophet 6 soon. I rarely use it to generate "organic" sounds, though. The Korg MS-20 lives the same wild life as the MS-10, with goat howls and snail whispers coming easily. The Micromoog is crickets and bees when it's not The Bass. Etc. The P6, for me, says "But I'm a synthesizer making synthesizer sounds!" I use it for gorgeous electronic musical tones primarily. I'm certain I could get a donkey cough or a wind-swept discotheque dungeon if I *needed* to, but I don't know I'd actually want to. Every creature has its place in the food chain or in the parking lot!