Robins egg

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Check out the blue eggs of the American robin. The striking blue color of robins’ eggs comes from a pigment called biliverdin. This pigment is produced from a shell gland and is thought to be an indicator of female fitness. Female robins with higher levels of biliverdin produce more brightly colored eggs. In turn, male robins have been shown to take better care of newly-hatched birds born from brightly colored eggs. This suggests that males use egg color as an indication of the healthiness of th Nature, Female Fitness, Female Robin, Robin Eggs, Strange Animals, Colored Eggs, American Robin, Blue Eggs, Easter Traditions

Check out the blue eggs of the American robin. The striking blue color of robins’ eggs comes from a pigment called biliverdin. This pigment is produced from a shell gland and is thought to be an indicator of female fitness. Female robins with higher levels of biliverdin produce more brightly colored eggs. In turn, male robins have been shown to take better care of newly-hatched birds born from brightly colored eggs. This suggests that males use egg color as an indication of the healthiness…

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Lori Packard Keras