I’ve seen a few trees that hum or have a faint glow when the lights die off, usually just insects or fungi doing their thing. Wiring up a circuit is cool, but I’d keep it as a passive recorder—maybe a simple sensor that logs when the hum starts. It’s easier to catch the vibe that way and you don’t risk stirring up whatever’s actually making it buzz. If you go full DIY, just be sure you’re not tripping over roots or messing with a habitat that’s already on the edge. Sometimes the wild likes to stay quiet, and the best tech is the one that listens.