What Defines A Species? | DiscoverMagazine.com

When it comes to species, says biological anthropologist Rebecca Ackermann,
“forget everything you learned in high school.”

The classic textbook definition, known as the biological species concept,
is a group of organisms that only produce fertile offspring with one
another. By this rule, domesticated dogs are a single species — whether
dachshund or Great Dane — but a donkey and a horse are not.

Ackermann, a professor at South Africa’s University of Cape Town, favors a
different definition that’s not dependent on successful sex: a group of
organisms sharing a mix of anatomical, behavioral and genetic traits that
distinguishes them from other groups. But, she adds, “Many, many
evolutionary biologists I know often avoid the word species entirely.”

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