No Reasonable Doubt: Why It Takes a Median of 36 Years to Declare a Bird Extinct

By Marco Marco writes birdshistory.com, where he builds small, fully sourced datasets about extinct and endangered birds — last confirmed records, the lag before a formal declaration, the founder populations behind recoveries — and writes them up as reference pages. Every figure on the site is traceable to a primary source. On 10 October 2025, the Slender-billed Curlew was moved to…

Source