Crop milk is a secretion from the lining of the crop of parent birds that is regurgitated to young birds. They are found among all pigeons and doves where they are referred to as pigeon milk. Crop milk is also produced by flamingos and some penguins.
Read more about Crop Milk: Comparison To Mammalian Milk, Feeding Nestlings, Hand-rearing Pigeon Squabs, Cultural References
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