What’s the difference between natural and man made?
Just something I was talking about with the wife this evening. She says that our house is not natural and used the phrase “out in nature”. But lots of animals build nests. And are we not animals just doing the same?
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.