Barbuda Mockingbird (Mimus gundlachii ssp.)

Today, the Bahama Mockingbird (Mimus gundlachii Cabanis) is restricted to the cays off northern Cuba, the Bahamas, Jamaica, as well as Turks and Caicos, where it inhabits semiarid scrubland. However, the species is known from at least two fossil or subfossil bones found on the island of Barbuda, Antigua and Barbuda, in the Lesser Antilles. [1]

Given the fact that the birds on Jamaica are treated as a distinct subspecies, I personally assume that the birds from the Lesser Antilles most probably also represented a distinct subspecies, which disappeared probably around the Late Pleistocene/Early Holocene border but might in fact have survived for somewhat longer. 

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References:

[1] Gregory K. Pregill; David W. Steadman; David R. Watters: Late Quaternary vertebrate faunas of the Lesser Antilles: historical components of Caribbean biogeography. Bulletin of Carnegie Museum of Natural History 30: 1-51. 1994

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edited: 17.02.2020