I have a Modern Game Bantam outside making a cacophony of sound pacing to get into the run, pacing the run, pacing to get out of the run. It's been going on for a half hour now. Her hind-quarters are larger than usual, which makes me think she's got a package 'needs delivering. She's new, hasn't laid in a week or so (MGBs aren't layers), and so I don't expect her to know to use the nest box -- so the wandering around restlessly doesn't concern me, but the duration of time she's been restless does make me nervous. How long does an egg song last before you start to suspect an egg-bound hen?