I do leave an amount of thistle growing because the chickadees love them! (I actually don't mind them either, I know they're not the 'friendliest' plants what with all those prickers but...they're pretty in their way!)
Toni its funny how several of us were thinking the same thing!
Oh wow I just looked at your link, it looks just like it!! How crazy!! Thanks Toni, that's really cool!