Sighting Record for Utah

Common name:	Chestnut-sided Warbler
Scientific name:	Setophaga pensylvanica
Date:	12/27/2025
Time:	0935
Length of time observed:	6-10 mins
Number:	1
Age:	immature?
Sex:	unknown
Location:	Corner of Industrial Drive and 300 E. Washington., UT
County:	Washington
Latilong:	37.117037, -113.502760
Elevation:	2700 ft?
Distance to bird:	50-100 ft?
Optical equipment:	Nikon Monarch 10x42, Canon PowerShot SX50 HS
Weather:	Cool, maybe 45
Light Conditions:	Cloudy, no breeze
Description: Size of bird:	smaller than a robin, a bit larger than the RCKI it was near
(Description:) Basic Shape:	warbler shaped.. leaner than a kinglet. YRWA size
(Description:) Overall Pattern:	Bright yellow green on head, back and wings, grey underparts.
(Description:) Bill Type:	Fine shaped bill but not needle thin. Perfect for bug eating
(Description:) Field Marks and Identifying Characteristics:	We were walking to go look at a pond and passed by some trees with bird movement. So we stopped to look. We saw a RCKI but I saw another bird that looked different. I watched it for awhile and noticed the very yellow green top of the head and back, the wing-bars, eye ring and the lack of color or streaking on the neck, belly on down the UTCs (although photos do show a very light yellow wash). I managed to get some less than ideal photos that do show shape, color, etc. I initially put it on our eBird list as warbler sp. as I wasn't 100%, then maybe 15-20 mins later it hit me it was a CSWA. I looked at Sibley, iBird Pro and we confirmed that was the bird we saw. (see photos)
Song or call & method of delivery:	Didn't hear a call. We were near a busy load road.
Behavior:	Flitting in the tree near a RCKI and some YRWA's.
Habitat:	Near a small creek and large field. Not 100% sure what tree type is. Willow?
Similar species and how were they eliminated:	YRWA- the lack of yellow rump, yellow sides and streaky chest eliminated this bird. RCKI- The incomplete eye ring, thinner bill and coloring eliminated this bird. BBWA- lacked Buffy flanks, yellow on sides of neck or white eye ring eliminated this bird.
Previous experience with this & similar species:	I have seen 3 other CSWA, all in Utah. Two immatures or females, one adult male.
References consulted:	Sibley, iBird Pro
Description from:	From memory From photo(s) taken at the time of the sighting
Observer:	Felicia Alvarez
Observer's address:	SLC, UT 84105
Observer's e-mail address:	**
Other observers who independently identified this bird:	Greg Cannon-gecdc@juno.com
Date prepared:	12/27/2025
Additional material:	Photos
Additional comments:	eBird checklist: https://ebird.org/checklist/S290599402