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A 160-Year Transformation: How Human Activity Redefined the Anna’s Hummingbird

Faye Romero spent six years on a question that already had a settled answer. The Anna’s hummingbird used to keep to Baja California and the southern edge of the state, but over the past century and a half, it pushed steadily north until reaching the Pacific Northwest and Alaska. For decades, ornithologists shared a tidy…
