Bicknell's Thrush

T.B. Ryder/USFWS

An environmental group says it has reached a settlement with the U.S. Fish and Wildlife Service over endangered species status for a rare migratory songbird which nests on mountaintops in northern New England, the Adirondacks and eastern Canada.

Larry Master, masterimages.org

An environmental group plans to sue the U.S. Fish and Wildlife Service for not giving endangered species status to a rare songbird that breeds on mountaintops in northern New England, the Adirondacks and eastern Canada, and winters in the Caribbean.

T.B. Ryder / USFWS

The U.S. Fish and Wildlife Service says a rare songbird that breeds atop mountains in the Adirondacks and northern New England may need protection as an endangered species.

The Bicknell's Thrush, which overwinters in the Caribbean, has one of the most limited breeding and wintering ranges of any bird in North America. It nests at high elevations in New York, Maine, New Hampshire and Vermont.

The Center for Biological Diversity in Richmond, Vt. launched the endangered petition.  Northeast Conservation Advocate Mollie Matteson.