Man-made VS "natural"

Why aren't man-made things considered natural?

Is the ball rolled up by a dung beetle not natural? Are beehives not natural? I recon they are; so why do only the things made by humans get their own shameful little corner?
No matter how fancy, our creations are still made out of whatever the Earth gives us, including our "Earth-damaging" plastic products.
It's alright to give something a label for the purpose of clearification, but "man-made" is one of those words that's being associated with evil, it seems.

People keep making this awkward distinction between humans and animals. It doesn't matter we wear pants, we're still just one of the many animals on this planet. We are "natural".