Egg Color
All eggshells are white, but two pigments can be added to change the color.
Eggs can be found with the pigment biliverdin, which
makes them blue-green, or
protoporphyrin, which makes the eggs brown.
Eggs can also be found patterned or spotted.
The Sorce:
Page #6
Ornithology #15
Life Cycle: The Egg #2
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