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It’s all with respect to humans. Humans aren’t making the bird nests, so they’re natural, not man-made. Our houses don’t over naturally, we build them.
From the bird’s perspective, sure, nests might be bird-made and humans are part of nature. But at humans, we’ve also done a ton to shape the world and separate ourselves from nature. If your house were a fire-heated lean-to in the woods, there might be less a distinction between it and “out in nature,” but if you’re living in a city or town, your immediate surroundings probably have been heavily constructed and modified by humans.
We have a Bluetooth adapter for our car audio and it’s great. Plugs into the aux jack and car power. Really handy not needing to plug in.