Don't try to go in there. It's the Juju's restroom.

I tried to warn that butterfly not to go in there, but my warning came a second too late. After taking this photo, even before the camera's shutter had shut completely, the hapless butterfly disappeared willfully through a small hole in the door. I did peek out the window hoping to watch him flap away into the forest below, but....he was... gone. It was as if the butterfly just vanished.

Perhaps the door is, as you say, a wormhole into the JuJu's bathroom. How unfortunate for the butterfly.