During the most recent ice age, glaciers divided an ancestral population of crows; one group became all-black carrion crows, the other hooded crows with gray breasts and bodies. Illustrations by François-Nicolas Martinet / Alamy
Protecting species from extinction has been a running theme in our pages over the years. Underlying these many stories was an assumption, at least on our part, that defining boundaries between species is settled science. We will no longer take that for granted:
Where Do Species Come From?
By studying crows, a German biologist has helped to solve a centuries-old mystery.
The evolutionary biologist Jochen Wolf was working from home when we first spoke, in April, 2020. Germany was under lockdown, and his lab, at Ludwig Maximilian University, in Munich, had been closed for weeks. Still, a reminder of his research had followed him from the office. “I have a crow nest right in front…
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