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Ammospiza is a genus of birds in the family Passerellidae, in the group known as American sparrows.

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The Cape Sable seaside sparrow is a subspecies of the seaside sparrow, a species of bird in the family Passerellidae native to the United States. This subspecies is endemic to southern Florida. It is designated endangered under the Endangered Species Act.

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LeConte's sparrow is one of the smallest New World sparrow species in North America.

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Nelson's sparrow is a small New World sparrow. This bird was named after Edward William Nelson, an American naturalist. Formerly, this bird and the saltmarsh sparrow were considered to be a single species, the sharp-tailed sparrow; because of this it was briefly known as Nelson's sharp-tailed sparrow.

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The saltmarsh sparrow is a small New World sparrow found in salt marshes along the Atlantic coast of the United States. At one time, this bird and the Nelson's sparrow were thought to be a single species, the sharp-tailed sparrow. Because of this, the species was briefly known as the "saltmarsh sharp-tailed sparrow."

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The seaside sparrow is a small American sparrow.

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The dusky seaside sparrow 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 Walt Disney World's Discovery Island in 1987, and the subspecies was officially declared extinct in December 1990.