What do you think of the crop circles around the world? Are they man-made or did someone or something else make them?

Hello! I'd like to know what do you think of the crop circles around the world. Do you think they are man-made or did someone or something else make them? And if so, who or what in your opinion? Thank you very much in advance for your answer(s). All the best! 🙂

P.S.: More on the matter for a start here: https://en.wikipedia.org/wiki/Crop_circle

And here's an example of a crop circle from Switzerland (image source: Wikimedia Commons):

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