The newest visitor

This one only arrived in the past week. Most interesting is that he/she (but it looks like a 'she' to me) comes up to the doors and stares in. If the doors are open, she almost wants to come in and raises a foot to do so, but then sees one of us and backs off. If the doors are shut, she'll bat at a finger which is run along the glass...she seems most curious as to what we're up to and will stand outside and stare in...