What best describes the crop in birds?

What best describes the crop in birds?

• A. An enlarged area of the esophagus used for temporary food storage
• B. A gland in the neck used for digestion
• C. A part of the stomach that grinds food
• D. A sac for storing feces

Answer: (A)

The crop is an enlarged pouch of the esophagus that serves as a temporary storage area for swallowed food. By holding and moistening material before it moves into the stomach, the crop lets a bird eat quickly and then digest later. In some species, the lining of the crop can also produce specialized secretions (such as crop milk in pigeons and doves) to nourish hatchlings. This function is distinct from other parts of the avian digestive system: it’s not a gland in the neck involved in digestion, it doesn’t grind food (that’s the gizzard), and it isn’t a fecal storage sac (feces are handled later in the digestive tract and cloaca).

The crop is an enlarged pouch of the esophagus that serves as a temporary storage area for swallowed food. By holding and moistening material before it moves into the stomach, the crop lets a bird eat quickly and then digest later. In some species, the lining of the crop can also produce specialized secretions (such as crop milk in pigeons and doves) to nourish hatchlings. This function is distinct from other parts of the avian digestive system: it’s not a gland in the neck involved in digestion, it doesn’t grind food (that’s the gizzard), and it isn’t a fecal storage sac (feces are handled later in the digestive tract and cloaca).