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Hummingbirds overwinter in Mexico and fly to the southern United States in the spring to breed. What are the hummingbirds doing?
A: Emigrating from the United States
B: Migrating from the United States
C: Immigrating to the United States
D: Remaining in the United States
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Hummingbirds overwinter in Mexico and fly to the southern United States in the spring to breed. What...
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