Sighting Record for Utah

Common name:	Philddelphia Vireo
Scientific name:	Vireo philadelphicus
Date:	9/17/11
Time:	1:35 PM
Length of time observed:	Five minutes
Number:	1
Age:	Unknown, but possible 1st year or drab adult
Sex:	Unknown
Location:	Salt Lake International Center on Billy Mitchell Road
County:	Salt Lake
Latilong:
Elevation:
Distance to bird:	Between 10 and 20 feet
Optical equipment:	Cabela's XT 8x42 and Nikon D5000 with 70x300mm VR Lens
Weather:	Hot and dry
Light Conditions:	Sunny, clear sky
Description: Size of bird:	5+ inches
(Description:) Basic Shape:	Vireo shape with relatively short tail compared to Warbling Vireo
(Description:) Overall Pattern:	Mix of yellow and white on underside. Upper mostly gray overall. Crown darker gray, strong contrast between the dark gray crown and white eyebrow . Strong contrast between lower eye stripe and dark gray cheek. Dark eye line including dark lore. Dark primaries.
(Description:) Bill Type:	Medium length and bulky
(Description:) Field Marks and Identifying Characteristics:	Crown was dark and contrasted strongly with white eyebrow. There was a dark eye line including a dark lore. The lower white eye stripe also contrasted with a dark gray cheek. The primary feathers were dark and the tail was relatively short. The underside was a mix of yellow and white. (see photos)
Song or call & method of delivery:	The bird did not call or sing.
Behavior:	Foraging from tree to tree
Habitat:	Primarily moving through Russian Olive trees and an occasional pine tree.
Similar species and how were they eliminated:	Compared to Warbling Vireo and eliminated by the dark lore and strong contrasts between dark crown and white eyebrow and lower eye line and dark cheek and the undertail coverts are more yellowish than you'd see on a Warbling Vireo. Eliminated Red-eyed Vireo because the bill was short compared to Red-eyed, the eye was dark/black, and there was a strong contrast between the lower eyeline and gray cheek.
Previous experience with this & similar species:	None with Philadelphia, but I have seen Warbling Vireos and Red-eyed Vireos.
References consulted:	Sibley Birds iTouch App, Sibley Guide to Birds of Western and Eastern Birds of North American, Audubon Guides, and iBird Explorer Western App.
Description from:	Notes made later
Observer:	Jeff Cooper
Observer's address:	3499 N 1270 W; Pleasant Grove, Utah; 84062
Observer's e-mail address:	jeffcooper7@gmail.com
Other observers who independently identified this bird:	Eric Huish
Date prepared:	9/18/11
Additional material:	Photos
Additional_Comments:	I will email the photos separately.