One thermopane of glass

Which is a good thing; if it was a single pane, a good deal more heat would get out. If it was no pane, Aoife would get out (or the squirrels would get in, obstreperous rodents) and little good would come of it.

So we have the basic scenario:
The would-be, and much frustrated, mighty hunter:
And a fine display of insouciant regard from the red squirrel:
The pictures of the attempted feeder looting are quite good, and I shall hopefully post them tomorrow.

The documented presence of this little fellow makes me more confident in my suspicion that the local grey squirrels are some of them red/grey hybrids.