Bored of the same?

Food - in
Poop - out.

Not for much longer I suspect, one trip s/he didn't actually get inside.  Were the "Barelygobs" (fledglings) large enough to reach up and close to "flutering" (fledging)?
I knew of "Fecal Sacks" but not if they were universal.  In the course of trying to find out I read that:-
"They use disinfectant.
Admittedly, you won’t spot a blue tit spritzing its nest with Dettol© (a word which the Spill chucker was unaware of), but scientists in Norway have discovered that these birds use medicinal plants to disinfect their living spaces.  They use aromatic plants such as lavender, mint, and curry leaves, which kill bacteria, to line their nests, thereby sterilising the area and making it safer to raise chicks in."