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Note added 8/4/12: DON'T PANIC. The original pictures in this thread were deleted from Photobucket, but post #2 has a link that will take you to the pictures on the UC Davis website.

This study was done by the animal science department at the University of California. They go through a series of images showing development of a 'tiel from the inside out so to speak. There are also two images of embryos that did not develop.

DAY 1 OF INCUBATION OF A HEALTHY FERTILE EGG


















LAST IMAGE SHOWING CHICK READY TO HATCH


-------------------------------------------------------------------
BAD EGGS





Growth Guide

Day 1
Appearance of primitive streak and first somite

Day 2
Appearance of amniotic folds; heart beats; blood circulation

Day 3
Amnion completely encircles embryo; embryo rotates to left side

Day 4
Eye pigmented; leg buds larger than wing

Day 5
Appearance of elbows and knees

Day 6
Appearance of beak; voluntary movement; demarcation of digits and toes

Day 7
Comb growth begins; appearance of egg tooth

Day 8
Feather tracts prominent; upper and lower beak equal in length

Day 9
Bird-like appearance; mouth opening appears

Day 10
Digits completely separated; toe nails

Day 11
Comb serrated clearly; tail feathers apparent; eye lid oval

Day 12
Eyelids almost closed and elliptical

Day 13
Appearance of overlapping scales; embryo covered with down; eye lid slit opening

Day 14
Embryo aligned with long axis

Day 15
Small intestines taken into abdomen

Day 16
Feathers cover body

Day 17
Head between legs

Day 18
Head under right wing

Day 19
Amniotic fluid disappears (embryo swallws it); yolk sac half withdrawn

Day 20
Yolk sac completely drawn into body; beak pips into air cell

Day 21
Shell pipping; normal hatching​
 
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