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Discover LudwigThe phrase "are extinct" is correct and usable in written English.
It can be used to describe species or groups that no longer exist.
Example: "Many species of dinosaurs are extinct, leaving only fossils as evidence of their existence."
Alternatives: "have disappeared" or "are no longer in existence".
Dictionary
Exact(60)
This includes only those species that are extinct or very close to extinction.
They are extinct.
Your hamburger's ancestors are extinct.
Six of them are extinct.
Many are extinct or on the wane.
Six families, primarily ground sloths, are extinct.
If prawns are extinct, use chicken drumettes.
A quarter of native birds are extinct.
The racists of the past are extinct.
Everyone knows that dinosaurs are extinct.
Chiquimulilla Xinka and Yupiltepeque Xinka are extinct.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com