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How Do Scientists Decide a Species Has Gone Extinct?

Getting it wrong can harm the very creatures that scientists are trying to protect.

Written byAndy Carstens
| 10 min read
A male and female Chiriqui harlequin frog (<em>Atelopus chiriquiensis</em>) photographed in 2010. The species was declared extinct in 2019.
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On an overcast October morning in 2021, self-taught ornithologist Mark A. Michaels was staking out a sweetgum tree in a Louisiana forest when he spotted a bird flying below the canopy about 50 yards away. Based on the bird’s size and long neck, Michaels first presumed he was looking at a duck. But then he noticed it intermittently tucking its wings during flight, something he says that ducks don’t do—but woodpeckers do. “Ivory-bill!” he recalls shouting, now certain that the bird was an ivory-billed woodpecker (Campephilus principalis), a species that hasn’t been definitively identified in the wild since 1944, and one that he’d been seeking for about 15 years.

Michaels, a research associate at the National Aviary, has had several possible ivory-bill encounters, including at that same tree, but he couldn’t fully convince himself of their authenticity. This sighting was different. “That was really the first time I was absolutely ...

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Meet the Author

  • A black and white headshot of Andrew Carstens

    Andy Carstens is a freelance science journalist who is a current contributor and past intern at The Scientist. He has a bachelor’s degree in chemical engineering from the Georgia Institute of Technology and a master’s in science writing from Johns Hopkins University. Andy’s work has previously appeared in AudubonSlateThem, and Aidsmap. View his full portfolio at www.andycarstens.com.

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