THE BRAIN AND NERVOUS SYSTEM BEGIN TO FORM.

BLOOD VESSELS APPEAR IN THE YOLK SAC.

LEGS, BEAK AND WINGS BEGIN TO FORM.

THE EMBRYO SEPARATES FROM THE YOLK SAC.

BEAK AND EGG TOOTH BEGIN TO FORM.

THE CHICK BEGINS TO MOVE IN ITS SHELL.

FEATHERS BEGIN TO FORM.

MOUTH OPENING APPEARS.

THE EMBRYO BEGINS TO LOOK MORE LIKE A BIRD.

BEAK STARTS TO HARDEN.

TOES ARE FULLY FORMED.

DOWNY FEATHERS GROW.

CLAWS ARE VISIBLE.

EMBRYO TURNS ITS HEAD TORWARD THE AIR CELL END OF THE EGG

SMALL INTESTINES GO INTO THE BODY.

EMBRYO IS COVERD WITH FEATHERS.

BEAK TURNS TOWARD AIR CELL.

EMBRYO PREPARES FOR HATCHING.

YOLK SAC IS NOW FOOD FOR THE EMBRYO.

EMBRYO BECOMES A CHICK AND STARTS BREATHING AIR FROM THE AIR SAC.

CHICK HATCHES!