Verification of Unusual Sight Record
For Utah

Rec. # 2015-20

Common name:

Blue-winged Warbler

Scientific name: Vermivora cyanoptera
Date: 06/02/2015
Time: 07:30
Length of time observed: 30 minutes (in hand)
Number: 1
Age: Second Year
Sex: Male
Location: Utah Test and Training Range - North
County: Box Elder
Latilong: 41.148995, -112.958077
Elevation: 4200
Distance to bird: In hand
Optical equipment: None
Weather: Clear, 65 degrees Fahrenheit, 5 mph wind
Light Conditions: Sunny
Description:        Size of bird:  
(Description:)       Basic Shape:  
(Description:)  Overall Pattern:  
(Description:)            Bill Type:  
Field Marks and
Identifying Characteristics:
Small warbler.

Bright yellow forehead, throat, breast, and belly. Olive nape and back. Black eye-line. Gray wings and tail. Two faint white wing-bars. White outer tail feathers. White undertail coverts.

Appears to be a second year male. White wing-bars are faint but present. Yellow on forehead is blended with olive on crown farther forward than on adult males. Black eye-line is not as dark as on adult males. White on outer tail feathers is prominent.

This bird was captured in a mist net on the UTTR. Measurements are as follows...
Unflattened wing chord: 53 mm
Tail length: 46 mm
Tarsus Length: 19 mm
Culmen length: 10.1 mm
Bill width: 3.8 mm
Bill height: 3.7 mm
Bird Weight: 8.0 g
(see photos)
Song or call & method of delivery:  
Habitat: Greasewood
Similar species and how
were they eliminated:
Prothonotary warbler. Our bird had a black eye-line and faint white wing-bars. White on outer tail feathers extends to the tip of the feather where prothonotary warbler will have black tips. Prothonotary warbler is larger in size and weighs substantially more.
Previous experience with
this & similar species:
No experience with blue-winged warbler. Very experienced with warblers common to Utah.
References consulted: Randy Larsen-Brigham Young University
Description from: From photo(s) taken at the time of the sighting
Observer: Jace Taylor, Tyler Glazier, Jesse Morris, Kyle Muncey
Observer's address: 894 W. 2225 S Syracuse, UT 84075
Observer's e-mail address: **
Other observers who independently identified this bird:  
Date prepared: 06/05/2015
Additional material: Photos