Birds have a muscular pouch called a crop in their esophagus. The crop holds food until it is ready for digestion. In some birds, the crop produces a liquid called "crop milk" for the birds to feed to their hatching chicks. The crop is made of muscle, tendon, epithelial cells, and nerves. The crop can best be described as -

Birds have a muscular pouch called a crop in their esophagus. The crop holds food until it is ready for digestion. In some birds, the crop produces a liquid called "crop milk" for the birds to feed to their hatching chicks. The crop is made of muscle, tendon, epithelial cells, and nerves. The crop can best be described as -

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➠ Milk for Babies

the major parts of the digestive system:

salivary glands.

pharynx.

esophagus.

stomach.

small intestine.

large intestine.

rectum.

accessory digestive organs: liver, gallbladder, pancreas.