'Over the past twenty-three million years, the forty-two species of bird of paradise all diverged from a single, crow-like ancestor into the breathtaking variety of forms now found on New...
"Over the past twenty-three million years, the forty-two species of bird of paradise all diverged from a single, crow-like ancestor into the breathtaking variety of forms now found on New Guinea and the surrounding islands. This makes this family a textbook example of allopatric speciation: as different populations became geographically isolated from each other by tall mountain ranges or oceanic straits, different selective pressures and random genetic drift caused the various independent groups to evolve into distinct forms that could no longer interbreed." Excerpt from Birds, published by Abrams, 2021
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