If a monkey takes a selfie in the forest, who owns the copyright?

Interesting! Are mentally disabled people also unable to legally own things?

Suppose instead of a monkey, a human stole the camera and activated the shutter. Who would own the copyright in this scenario? I assume the thief. The consequence of this assumption is that the camera owner is not the copyright owner. The monkey may not be endowed with ownership rights, but this does not mean that the camera owner receives these rights. Instead, no-one owns the copyright, and by "no-one" I mean everyone.