Crop milk is a nutrient-rich substance produced by certain birds, including pigeons and doves, to feed their young. Unlike mammalian milk, crop milk is formed in the bird's crop, a specialized pouch in the digestive system. It is a thick, creamy fluid that contains proteins, fats, and antibodies, providing essential nourishment for the chicks during their early development. This unique feeding method allows parent birds to nourish their offspring with a highly concentrated source of nutrients. Crop milk is produced in response to hormonal changes and is regurgitated by the parents, ensuring that the chicks receive the necessary sustenance for growth and health.