Verification of Unusual Sight Record
For Utah

Rec. # 2016-21

Common name:

Philadelphia Vireo

Scientific name: Vireo philadelphicus
Date: Aug 30, 2016
Time: 11:40 AM
Length of time observed: 10 mins
Number: 1
Location: Utah Lake North Shore
County: Utah
Elevation: 4,200'
Distance to bird: 70-100'
Optical equipment: 8x42 binoculars and 500mm lens
Weather: Sunny and clear
Light Conditions: Good light
Description:        Size of bird: small
(Description:)       Basic Shape: passerine
(Description:)  Overall Pattern: gray and yellow
(Description:)            Bill Type: semi-thick--not dagger like
Field Marks and
Identifying Characteristics:
I spotted a vireo moving in the trees, and when it flew I could see a lot of yellow on the undersides. I actually was thinking it would end up being a bright Cassin's or a BHVI. However, when it landed and I saw it, I could see it was more compact, and not a solitary spuh. The bird had a dark lore with obvious white eye-line, and under-eye arc. Yellow throat, and undersides were easy to see even from 70' below. \
(see photos)
Song or call & method of delivery: none
Behavior: Feeding in the tree tops and moving with a flock of warblers, and chickadees harassing a Cooper's Hawk. I never actually saw the vireo go after the hawk though.
Habitat: Deciduous. Migrant Trap surrounded by farm on the north, and Utah Lake and on the south.
Similar species and how
were they eliminated:
Warbling Vireo lacks dark lores, and extensive yellow underneath.
Previous experience with
this & similar species:
See 100's of WAVI annually, and have seen PHVI numerous times in the midwest and once in Utah.
References consulted: none
Description from: From memory
Observer:  Tim Avery
Observer's address:  
Observer's e-mail address: **
Other observers who independently identified this bird:  
Date prepared: Aug 30, 2016
Additional material:
Additional comments: