Dusky Seaside Sparrow
 The Dusky Seaside Sparrow Ammodramus maritimus nigrescens was a non-migratory subspecies of the Seaside Sparrow found in Florida in the natural salt marshes of Merritt Island and along the St. Johns River. The last definite known individual died on June 17 1987 and the subspecies was officially declared extinct in December 1990.