Are crop circles made by aliens

I just read some internet thing about the latest jellyfish crop circle in oxfordshire
So erm basicallly are people doing these or aliens because its abit like perfect like do people do theese creations
Im 16 and I dont know

They're made by dudes with rope and planks of wood.

Crops circles are pranks made by people.

It really doesn't even make sense that aliens would visit the earth just to make crop circles.

Why would aliens come to earth and make crop circles? What good would that do? Maybe they make them in corn fields because their planet ran out of food and theyre really hungry! lol