How does an egg develop from the time it is laid to the time it hatches? Come explore with us the fascinating 21-day life cycle of the embryological chick. (Please note: Days 17-20 have been combined with Day 21.)

Pop Quiz!

Please note that this page contains an error! Can you figure it out? Do you see it?

The eggshells are upside down! Yes, we goofed during production of the graphics on this page. The chick actually develops with its head toward the large, flat end of the egg. Just imagine the eggshells flipped upside down when looking at these pictures.

Day 1 The Journey Begins	Day 2 The Heart of the Matter	Day 3 Say Cheese!	Day 4 Setting Up Camp
Day 5 What Came First: the Chicken or the Egg?	Day 6 Who Do I Look Like?	Day 7 Jumpin' Genes!	Day 8 Egg Nutrition
Day 9 Name That Artifact	Day 10 Egg Chemistry	Day 11 Birds of a (Colored) Feather	Day 12 Image Processing
Day 13 Yolk! Yolk! Yolk!	Day 14 The Skeleton	Day 15 The Respiratory System	Day 16 What Shape is an Egg?
Day 17 Let's Plan A Birthday Party!	Day 18 Let's Plan A Birthday Party!	Day 19 Let's Plan A Birthday Party!	Day 20 Let's Plan A Birthday Party!
Day 21 Happy Birthday!