The only specimen is now lost Quite a few bird species of the past were described from only a single specimen that is now lost. One of them is the Tongatapu rail. Of this rail species (family Rallidae), historical reports and descriptions have survived that are based on observations and
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An illustration of the extinct Tongatapu rail, created between 1772 and 1775, by Georg Forster? (© George Forster, Public domain, via Wikimedia Commons)

