Verification of Unusual Sight Record
For Utah

Rec. # 2006-09(R82)
(Transcribed by M. G. Moody)

Common name:

Philadelphia Vireo

Scientific name: Vireo philadelphicus
Date: 29 April 1982
Time: 5:45 p.m. to 5:55 p.m.
Length of time observed:  
Number: 1
Age: -  (Plumage: Spring - no change)
Location: Near Botany Pond, BYU Arboretum, BYU, Provo Utah
County: Utah
Distance to bird: 80 ft. (estimate, after pacing to base of tree)
Optical equipment: Bushnell 10x40 roof prisms
Light Conditions: Sun behind me, bird towards east.  Good light, clear sky, 50īs
Description:        Size of bird:  
(Description:)       Basic Shape:  
(Description:)  Overall Pattern:  
(Description:)            Bill Type:  
Field Marks and
Identifying Characteristics:
When I initially saw this bird I identified it as a Warbling Vireo - it showed a white eye tripe with a darker stripe through the eye becoming somewhat darker in the lore region.  The back, head, forehead rump & tail were a uniform gray green, greener than the familiar grayish green back of the Warbling Vireo.  The under parts were vividly yellow, becoming less intense towards the belly.  Sometimes a Warbling Vireo shows a slight "crest"; this bird did not.  There were no wing bars and the eye itself was dark as was the bill. 
Song or call & method of delivery: silent
Behavior: Bird was feeding about 40 ft. up in a narrow lead poplar, deliberately moving from emerging leaf bundle to bundle.  The bird stayed on the same section of the tree for the ten minutes I observed, moving and picking insects off the new leaves.
Habitat: A hillside arboretum with artificial creek meandering through lots of underbrush, some exotic species of shrubs present.  Trees are representative of the United States.  This is a pretty "birdy" area I check once or twice weekly.
Similar species and how
were they eliminated:
After I initially thought Warbling Vireo, the yellow underparts made me reconsider.  The yellow I have seen on Warbling Vireos has always been lightly imposed on the sides (when present).  This guy was yellow from chin to belly.
The bill (thick) and stubby build discounted Tennessee Warbler, which in spring shows no yellow under  parts anyway.  There were plenty of orange-crowneds nearby for comparison.
Previous experience with
this & similar species:
I see lots of Warbling Vireos every summer.  I have seen Tennessee Warbler once previously.  I have never seen a Philadelphia prior to today.
References consulted:  
Description from: Notes made after the observation
Observer: Mark T. Bromley
Observer's address: 1480 N. Jordan Ave, Provo, Utah  84604
Observer's e-mail address:  
Other observers who independently identified this bird:  
Date prepared: (1982)
Additional material:  
Additional comments: