What’s happening to the chick on Day 11?

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.

Day 11

What’s happening to the chick on Day 8?

The third eyelid, a transparent membrane which keeps the eye moist and free from grit is developing today. It’s clear so that the chicken can keep an eye open – literally – for predators even as it blinks.

The pterylae or feather tracts – the part of the chicken’s body from which the feathers sprout – are developing today and the down the chick will be born with, known as natal down, is growing.

Day 8

What’s happening to the chick on Day 4?

On the fourth day the chick’s entire body turns and lies down with its left side on the yolk. The head and tail come close together so the embryo forms a “C” shape. The mouth, tongue, and nasal pits develop as parts of the digestive and respiratory systems. The heart continues to enlarge even though it has not been enclosed within the body.  By the end of the fourth day of incubation, the embryo has all organs needed to sustain life after hatching, and most of the embryo’s parts can be identified.

Day 4