Belding's Sparrow is a subspecies of Savannah Sparrow that lives exclusively in the coastal salt marshes of Southern California through Baja California, Mexico. In 2002, when I saw my first Belding's at the Bolsa Chica Ecological Reserve in Huntington Beach, they were on the Federally endangered list. I believe they still are, but their populations have been slowly increasing due to the revitalization of some of their native pickleweed salt marsh habitat (e.g., the Ballona wetlands in Los Angeles).
From Kaufman Focus Guide: Birds of North America:
VOICE: Short notes before and after trill, sip sip sip sreeeeeeee, sip. Call note sharp ssip.
4/13/02 Upper Newport Bay Ecological Reserve, Orange County, CA
LIFE LIST NOTES:
COMMON NAME: Belding's Savannah Sparrow
COMMON NAME: Belding's Savannah Sparrow
SPECIES: Passerculus sandwichensis beldingi
LIFE LIST DATE: 3/16/2002
COUNT: 3
LOCATION: Bolsa Chica Ecological Reserve, Huntington Beach, Orange County, CA
IDENTIFYING MARKS & BEHAVIOR: A streaky little sparrow that sits in the open. Heavily streaked on chest, strong face pattern. Often shows yellow in front of eye. Belding's form is darker/blackish.
VOICE: Short notes before and after trill, sip sip sip sreeeeeeee, sip. Call note sharp ssip.
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