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A portion of the digestive tract of a bird that is a modification of the stomach and secretes gastric juices that initiate digestion is the -.
crop
gizzard
proventriculus
pylorus
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The portion of the digestive tract of a pigeon that produces “pigeon’s milk” used in feeding young is the -.
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In some birds, for example spotted sandpipers, males establish nest sites. A female will mate with more than one male and lay a clutch of eggs in each male’s nest. The males then care for the eggs. This reproductive process is called -.
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