🐣During development, an embryo relies on oxygen exchange through blood vessels close to the eggshell.
🥚When a chick is ready to hatch, it creates an air pocket to breathe and withdraws blood through the umbilical cord.
🔎Listening to the chick inside the egg helps determine the right time for intervention.
💪Assisting a weak chick requires considering the absence of blood in surrounding veins to prevent bleeding.
🦾Helping a chick hatch requires a small window of opportunity when it is still alive but not too weak.