Sierra Buttes, California: Less than 9,000' high, but the tallest thing around...with active insect soundscapes!
The thing that strikes me the most about recording at high altitude is the quiet. Sounds that get masked by wind, rustling leaves of trees, traffic, and other sources become extremely articulate. Unless there are birds nearby, this usually means that insects are what comes to the ears most clearly.
Atop a California mountain on a sunny summer day, I came upon a patch of blooming buckwheat that was being visited by bees and other insects. The trees were pretty far away, but cicadas were singing loudly, and the wind was pretty still. I set down my recorder and walked away for about 20 minutes to bag a nearby peak.
The killer moment in this otherwise quite ambient snippet is right near the end, when a huge, fat something buzzed right past the mics. I’m assuming it’s a type of bee, but with such a deep, rumbling sound, it sounds like a cartoon or a parody of an insect sound, like something out of A Bug’s Life, as opposed to a real creature. Since I walked away during the recording, I’ll never know!
[Sony PCM-D50 field recorder]