The other day I was out in the backyard doing something, I forget what now, but I was out there anyway. I came across this opening into a tree way back in the back part of the yard. You can see it's cleverly hidden but it is there. A way inside.
I'm not sure how far back it goes, I didn't want to stick my hand in, it might be boobie trapped. And besides, I didn't want to disturb the tree people.