Editing Vesper sparrow (section)

== Description ==
The vesper sparrow is {{cvt|14|-|16|cm}} in overall length and weighs {{cvt|19.5|-|28.3|g}}.<ref name=hbw>{{ cite book | last=Rising | first=J.D. | year=2011 | chapter=Family Emberizidae (Buntings and New World sparrows) | editor1-last=del Hoyo | editor1-first=J. | editor2-last=Elliott | editor2-first=A. | editor3-last=Sargatal | editor3-first=J. | title=Handbook of the Birds of the World | volume=16: Tanagers to New World Blackbirds | location=Barcelona, Spain | publisher=Lynx Edicions | isbn=978-84-96553-78-1 | pages=428–683 | chapter-url=https://archive.org/details/handbookofbirdso0016unse/page/563/mode/1up | chapter-url-access=registration }}</ref> Adults have light brown upper-parts and light under-parts, both with darker streaking. There are three features that are unique to the vesper sparrow. The first is the presence of a small, white ring surrounding the eyes. The second is the flash of white tail feathers seen during flight. The third is the presence of a chestnut patch on the shoulder. However, this is usually not visible to an observer.<ref>{{Cite web|title=Vesper Sparrow Overview, All About Birds, Cornell Lab of Ornithology|url=https://www.allaboutbirds.org/guide/Vesper_Sparrow/overview|access-date=2021-03-15|website=www.allaboutbirds.org|language=en}}</ref>

Another notable characteristic is that some vesper sparrows, especially west of the [[Cascade Range|Cascades]], tend to have a more pinkish hue. They also do not have a bold eyeline found in some sparrows.<ref>{{Cite web|title=Vesper Sparrow|url=http://birdweb.org/birdweb/bird/vesper_sparrow|access-date=2021-03-15|website=BirdWeb|language=en}}</ref>

The male sings from a higher perch, such as a shrub or fencepost, which indicates his ownership of the nesting territory. The musical song begins with two pairs of repeated whistled notes and ends in a series of trills, somewhat similar to that of the [[song sparrow]]. They have slurred whistles with one lower pitch followed by a second higher pitch. Furthermore, vesper sparrows make use of short descending trills as a part of their song.