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First Day of Spring
By March 20th, Rufous Hummingbirds are already entering Canada. At the same time, Ruby-throated Hummingbirds are in the southern United States, along the Gulf Coast. Measuring by latitude, the Rufous is 1,000 miles farther north than the Ruby-throat on the first day of spring. How can such similar birds have such different migration patterns?

Comparative Map