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Tan-striped form and white-striped form.
Tan-striped form and white-striped form.

Natural Selections: white-throated sparrow

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Dr. Curt Stager describes the differences between two variations of the white-throated sparrow - the white-striped form and the tan-striped form. Though the birds are from the same species and are complementary in some ways, their looks and behaviors are very different. Martha Foley asks: which is more competent?

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