We’re halfway there! Chick development is really starting to speed up. The legs are developing scales, the toes are growing and curling, and the tiny comb grows a serrated edge. The main blood vessel – the aorta – can be now be seen along the neck. The chick’s intestine begins to push its way into the yolk sac. This happens so that the chick can fully absorb the yolk before it hatches and “take its lunch with it” when out of the shell.