The young are fed crop milk by the parents.

It is not known how the young were fed, but related pigeons provide crop milk.

Both parents feed the squabs crop milk for the first 3-4 days of life.

Crop milk is also produced by flamingos and some penguins.

The nestlings were fed crop milk exclusively for the first three or four days.

The baby squabs are fed on pure crop milk for the first week or so of life.

Crop milk produced by parent birds may occasionally be replaced with artificial substitutes.

Mourning Doves eat almost exclusively seeds, but the young are fed crop milk by their parents.

Thereafter, the crop milk is gradually augmented by seeds.

Article on the relationship between crop milk and clutch size in Mourning Doves (.

Once the egg has hatched, the chick is fed on crop milk and then regurgitated seeds.

Contemporary depictions show a large crop, which was probably used to add space for food storage and to produce crop milk.

The risings on the crop of the female may have covered glands that produced the crop milk.

They raise their young on "crop milk," a mix of regurgitated food and salivary enzymes, which is rich in protein.

Members of the order Columbiformes, such as pigeons, produce a nutritious crop milk which is fed to their young by regurgitation.

In adult doves and pigeons, the crop can produce crop milk to feed newly hatched birds.

Another well known example of nourishing young with secretions of glands is the crop milk of pigeons.

Like mammalian milk, crop milk contains IgA antibodies.

In addition, a substance secreted by pigeons to feed their young is called crop milk and bears some resemblance to mammalian milk.

The pigeon family, flamingos and penguins have adaptations to produce a nutritive fluid called crop milk that they provide to their chicks.

Crop milk is a way of feeding from the crop of parent birds, by regurgitating to young birds.

New Zealand Pigeons build flimsy, shallow, twiggy nests and feed crop milk to hatchlings.

Crop milk bears little resemblance to mammalian milk, the former being a semi-solid substance somewhat like pale yellow cottage cheese.

These names literally mean "bird's milk" or crop milk, a substance somewhat resembling milk, produced by certain birds to feed their young.

Both male and female pigeons, Ms. Day said, feed their babies with a substance called crop milk, secreted at the bird's neck, or crop.