Cool YouTube video that shows how chicks develop in the egg, all the way from day one.
Often eggs in your incubator will be pipped or cracked, but the chicks just don’t hatch. There are many factors that contribute to this.
For our first hatch in a HovaBator 1620, we put in a barnyard mix of eggs, from our free-range flock, that consisted of Russian Orloff Bantam, Serama, RIR, BO, Silkie cross, Crested Polish cross, Splash Wyandotte, and some mystery eggs.