Last Specimens
Captive breeding of all remaining dusky seaside sparrows with the Scott's Seaside Sparrow (A. m. peninsulae) from Florida's gulf coast was approved in 1979. By 1980 five dusky seaside sparrows were in a captive breeding facility in Gainesville, Florida. One, banded in 1978 with an orange leg band was unique.
"Orange Band" was left by himself on the St. Johns Unit of the St. Johns NWR after a yellow-leg-banded dusky was captured in 1979. Field observations of color banded sparrows from 1975 to 1979 indicated that dusky seaside sparrows seldom traveled more than a mile or two in their lifetimes. In April 1980, "Orange Band" was again observed on the St. Johns Unit, but was surprisingly captured in June eight miles south on the Beeline Unit in the company of a dusky with a green leg band. Before finding "Green Band", "Orange Band" passed the general vicinity of the two unbanded dusky seaside sparrows.
In 1983 the last four living dusky seaside sparrows were taken to Walt Disney World Resort, to continue crossbreeding and living out their days in a protected habitat on the Discovery Island nature reserve. By March 31, 1986, only "Orange Band" remained.
Despite being blind in one eye, "Orange Band" reached extreme old age for a sparrow, living at least nine years, and possibly as many as thirteen, before dying on June 17, 1987.
After the death of the final “pure” dusky sparrow, the breeding program was discontinued due to the fact that it was thought the hybrids that exist could not reproduce to create dusky sparrows, since they did not share the proper mtDNA that dusky sparrows possess. However, research done on a similar species known as Passerella iliaca, or the fox sparrow, was able to show that some subspecies of one plumage group had the plumage of another despite having the “wrong” mtDNA type. This potentially meant that if the breeding program was continued with the dusky sparrow hybrids, sparrows with the same color plumage as the dusky sparrows would eventually be produced. Unfortunately, shortly after the breeding program was halted, the remaining hybrid sparrows either died or escaped captivity, leading to the final extinction of the taxa.
"Green Band" proved elusive, and was never recaptured after having been banded. He was last seen on July 23, 1980 (Walters 1992).
Read more about this topic: Dusky Seaside Sparrow
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