Verification of Unusual Sight Record
For Utah

Rec. # 2010-41

Common name:

Lesser Black-backed Gull

Scientific name: Larus fuscus
Date: 02-25-09
Time: 1445-1520
Length of time observed: ~ 20 minutes
Number: 1
Age: Adult
Location: Farmington Bay WMA
County: Davis
Latilong: 5
Elevation: ~ 4300 ft
Distance to bird: 20 m
Optical equipment: 20-60x scope
Weather: clear and calm
Light Conditions: clear direct sunlight
Description:        Size of bird:  
(Description:)       Basic Shape:  
(Description:)  Overall Pattern:  
(Description:)            Bill Type:  
Field Marks and
Identifying Characteristics:
Small adult Lesser Black-backed Gull. Relatively small and delicate gull. Considerably smaller than nearby Glacous, Herring, Glacous-winged, Western, and Thayer's Gulls; slightly larger than Ring-billed Gulls, and about the same size as California Gulls.
Bright white head, nape, throat, chest, belly, undertial coverts, and tail. Dusky streaking behind and above both eyes, and few slight dusky streaks on bottom of hind neck. Eyes pale with red orbital ring. Dark blackish gray mantle. Folded wing with black primary tips and offset white tertial and secondary crescents. Slender yellow bill with large red gonydeal spot. Bright yellow legs.
(see photos)
Song or call & method of delivery: na
Behavior: feeding on dead carp, swimming and resting on ice.
Habitat: wetland impoundment
Similar species and how
were they eliminated:
Other dark-backed and white-headed gulls much larger than this individual. Combination of dark back and yellow legs rules out the majority of gulls. Yellow-footed Gull considerably larger with a heavy stocky build. Kelp Gull larger with greenish yellow legs.
Previous experience with
this & similar species:
References consulted:  
Description from: Notes taken at time of sighting
Observer: Rick Fridell
Observer's address: Hurricane, UT
Observer's e-mail address:
Other observers who independently identified this bird: although there were a couple Lesser Black-backed Gulls reported during winter 09 at Farmington Bay, I'm not aware of any adults observed that fit this bird.
Date prepared: 10-05-10
Additional material: Photos
Additional_Comments: Description above copied from field taken while observing gulls at Farmington Bay WMA on 02-25-09.