LeConte's Sparrow
Ammospiza leconteii
LeConte's sparrow is a small sparrow with a relatively large head, short grey bill and short pointed tail. It has a buffy yellow-orange face with grey cheeks, and a dark brown crown with a white central stripe. The nape of the neck is lilac grey with chestnut streaks, and the back is streaked with brown and beige. Its belly is off white, while the breast and sides are a buffy orange-yellow with dark brown streaks. The feet and legs are a brownish-pink colour. Voice: The male's song resembles a grasshopper buzz with a short squeaky introductory note and ending with a short chirp. It is often described as tika-zzzzzzzzzzzz-tik while the call is a short tsip. It is most commonly confused with the song of the Nelson's sparrow.
ID text from Wikipedia, CC BY-SA 4.0

Seaside Sparrow
Ammospiza maritima
Adults have brownish upperparts with gray on the crown and nape, and a grayish-buff-colored breast with dark streaks; they have a dark face with gray cheeks, a white throat, and a short, pointed tail. Birds show a small yellow streak just above the eye. A typical seaside sparrow lifespan in 8 to 9 years of maximum. The oldest record of seaside sparrow was an individual male which was at least 10 years old when recaptured and re-released during the banding operations in South Carolina.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: LeConte's Sparrow and Seaside Sparrow.