what changes happen to a birds body before migrate?
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In preparation for migration, the gut increases in size tremendously over several days," McWilliams said. "It expands, its cells get larger and it produces new cells so the bird can dramatically increase its food intake and store up energy for the long flight.
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"The gut of a migratory bird is a really dynamic organ. In preparation for migration, the gut increases in size tremendously over several days," McWilliams said. "It expands, its cells get larger and it produces new cells so the bird can dramatically increase its food intake and store up energy for the long flight."
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