Sometimes he jumps to the nice looking rock on the background, or tries to dig in to the moist looking ground, or tries to climb the lush greenery on the background. The background wasn't there when I first placed him, maybe he feels some relocation stress due to the new background?
I am kinda worries this cause some minor injury due to his head colliding with the glass, or being stressed because he can't access the good looking scenery.
Mine did the same thing - tried to climb the desert cactus - I got rid of it -- you can always replace the background w/ newspaper wrapping paper etc..............
Karrie
They all do this pretty often. He may eventually grow out of that phase once he figures out
he isn't able to climb it.
As suggested, you can always take that down & replace it with a brown butcher's paper or
just regular white paper. Or you could leave up the background & then just put up some paper
over the background so you can use it later.