this post was submitted on 29 Aug 2023
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It means the species was around for a long time before they thought it went extinct.
As stated in the article:
Then pretty much every species is prehistoric right? Everything that hasn't popped up in the last 5000 or so years.
When it comes to animals they're not usually referring to only "before writing" prehistory but rather "before humans" or "from early humans and older" prehistory. It's more of a colloquial use of the term referring to some of the oldest species of animals.
Though you'd be surprised at how many species have only evolved in the past 5000 years or so.