'Pigeon milk' is produced by – (1) Crop (2) Birds (3) Mammals (4) All of the above

'Pigeon milk' is produced by – (1) Crop (2) Birds (3) Mammals (4) All of the above
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(2) Birds Explanation: 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. Crop milk bears little resemblance to mammalian milk, being a semi-solid substance somewhat like pale yellow cottage cheese.
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