We waited hours before deciding to assist. The baby quail just kept pecking in one spot with no progress. He was malpositioned and had the absorbed umbilical yolk sack stuck to the back of his head. We did the zip ensuring moisture from a q-tip dipped in water while in a humid bathroom. We took part of the membrane off carefully just enough to free movement. Then put him back still in the bottom of his shell with top shell loosened quite a bit. He took over from there and survived!!! Hallelujah! He would not have made it without help. You can see umbilical or membrane still stuck to the back of his head in photo. Wet q-tip helped remove the rest. We are glad we assisted him.