This is the state it was in at the beginning of the day. (Well actually I'm sure it was several hours into Babe's day, but at the start of ours!)
The female great tit, who is called Babe, is continuing to build her nest at a great rate.
Great tits are clearly bigger birds than bluetits. Here Babe has such a large amount of moss in her beak that she finds it difficult to get it through the hole! She actually falls off twice in the struggle!
Eventually, she gets it positioned correctly ...
.... and manages to push it through in front of her.