I have no idea how the little **** got up there, but he scared me half to death. The hut he's on doesn't really have anything climbable to get to the top and nothing around it either. I think it will forever be a mystery. He wasn't very happy when I took him down either.
They are always finding ways to amaze me. They are certainly quite the little characters. I just got them a new tank heater since winter is coming and they spent about an hour climbing on it and inspecting it when I first put it in.