Bird Identification: CLOSED: Has anyone seen a nest like this one?, 1 by JanetS

JanetS wrote:
It is in a little nesting box that chickadees used last year...I never see the bird. BUT I think I saw a little creeper type bird go in there last week. I just thought it was looking...lol What do you think...it is NOT a cup nest for sure...it appears to have an entrance at the hole of the birdhouse and then maybe an exit at the top rear...of course they can't get out there because of the roof of the house...so I don't know...