Candling During Incubation: The First Week.
DAY 6 duckling development image
From Daily Changes in the Weight and Form of the Developing Chick Cornell Bulletin 205, by Dr. A. Romanoff (1931) duckling development image
What's Happening Now
formation of reproductive organs and differentiation of sex Elbow and knee joints 1st 3 toes grooves between all digits; beak barely visible
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What to Look For
Sometimes the embryo is on the 'far side' of the yolk. Set the egg on the candler and wait 10-30 seconds to see if it appears.
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What to Watch Out For
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If you are not sure whether the embryo is OK or not, wait another few days.