Easter's New Life

I'm fascinated by eggs.  Chickens are admittedly not the brightest creatures I have ever seen, but eggs?  They're amazing.  Eggs have about 10,000 pores in the shell.  These are to allow gas exchange for the developing chick. Inside the egg is the membrane.  You know that thin skin that keeps the shell kinda together when you peel a hard-boiled egg.  That membrane keeps the yolk and white and all the other 'stuff' inside the porous egg shell.  If you've ever hard-boiled an egg, you'll also notice a flat spot.  This isn't for your convenience after you cook the egg.  This is an air pocket to give the developing chick enough air to survive inside that egg for 21 days.  After about 19 days (or 22 if you are watching our very lazy chicks...), the chicks run out of air and have to peck through the shell to get enough air to continue hatching.  Sometimes the hen will do this for the chick.  We'll get back to her roll in a minute.  To peck through the shell, chicks have a tiny egg tooth on the tip of their beaks to get through that tough shell.  Once the hole has been pecked, the chick rests and begins absorbing the yolk for energy and begins pecking around the shell in a circle until it's cut the top off and can come out.  Now the hen, although not very bright, has an important roll in all of this.  She keeps the eggs at a perfect 99.5*F 23 hours a day.  She, like most birds develop a small bald or thin patch of feathers on her stomach to allow adequate heat transfer.  She also turns the eggs a minimum of 4 times a day, sometimes once an hour.  This is so the embryo doesn't stick to the side of the egg.  She also maintains a perfect humidity between 55 and 70%.  Then on day 18, the humidity has to stay at a constant 70+% to allow the shell to soften enough to let the chicks peck through.  On day 19, she can start to hear peeping through the shell and may peck a small hole in the egg, but will not aid any more in the hatching of the chick.  Hatching is how the chick develops muscles and can live outside of the egg.  By day 21, the eggs are mostly hatched, and the hen will abandon any that aren't developing.
This is my question:  How did all this come about?  How does the hen know to sit for 21 days?  How does her body know to create a bald spot?  How does she create a shell with 10,000 pores, any more and the shell would be too brittle, any less and the chick would suffocate?  How does she know to turn the eggs? How does the chick develop the perfect tool to get through that thick shell?
To me, the lowly chicken egg is one of the best examples of God's creative, thoughful design.  And to see a chick emerge from the egg is an amazing analogy to Christ's resurrection.  That chick fought to get out, just as Christ conquered death for us.  It would be easier to just give up, but Christ and the chick knew they couldn't do that.  Winning that battle was important enough to keep fighting.  And no one else can help them fight.  There is no eligible substitute.  Christ paid it all for us, and for that I'm so thankful.  And I'm thankful for the incredible chicken egg that reminds me of God's incredible design.  If he put so much thought into designing the chicken, how much more has he put into my design?
And how graceful of God to remind me of all these things than for our first egg to hatch on Easter.