Sighting Record for Utah

Common name:	Rivoli's Hummingbird
Scientific name:	Eugenes fulgens
Date:	7/3/2024
Time:	5:35pm~
Length of time observed:	Twice in about 1/2 hour, both visits about 2 minutes, so 4 minutes total
Number:	1
Age:	?
Sex:	Female
Location:	Upper Weber River Valley Uinta Mountains.
County:	Summit
Latilong:	40.784598,-111.1656879(approximate)
Elevation:	7,200ft~
Distance to bird:	3m
Optical equipment:	Nikon 10x42 Binoculars
Weather:	Sunny, breezy, clear, 65F
Light Conditions:	Good
Description: Size of bird:	Large hummingbird
(Description:) Basic Shape:	hummingbird
(Description:) Overall Pattern:	green back, grayish torso
(Description:) Bill Type:	nectarivore
(Description:) Field Marks and Identifying Characteristics:	Initially seen by Lee Burke at his Cabin feeders on 6/28 at 5:30~, poor photos taken and sent to me for ID. I visited his Feeders on 7/1 without seeing the bird, but returned on 7/3 after he re-saw it on 7/2. It arrived within a few minutes of my arrival, feeding on the feeder for a couple minutes, left but returned again about 30 minutes later for a couple minutes. I initially noted its size which set it apart from all the other hummers present immediately, about 50% larger. The back was a solid deep emerald green, including the rump, tail, wing coverts and crown. Very long black bill, grayish torso with some green spangles on flanks and belly, bold white eyeline behind eye and weak line below eye, grayish throat. Tail had white tips of outer tail feathers limited to about 1/4 of length. Lee asked me to submit the record. (see photos)
Song or call & method of delivery:	Heard sharp single chip notes, louder than other hummers
Behavior:	Visiting nectar feeders at private residence
Habitat:	Riparian river bottom in lower montane habitat, Narrow-leaved Cottonwood woodland, with some conifers and open wet-meadows and willow thickets nearby. Weber River about 20m from feeders
Similar species and how were they eliminated:	Most other North American Hummingbirds eliminated by size, including direct comparisons with Black-chinned, Rufous and Broad-tailed, all of which it was significantly larger than by about 50%. Blue-throated Mountain-Gem is the only other Hummingbird this species could be confused with north of Mexico. Telling females of this species from female Blue-throated Mountain-Gem can be challenging, but through my 4 trips to Arizona I have learned to deal with this. Blue-throated are drabber with a bronzy rump and duller gray-green back and gray torso without any green spangles, but the tail is the key, Blue-throated have a striking blue tail with huge bold white corners that make up about 1/2 the length of the tail. Also their bill is not as long in proportion. This birds tail with limited white, very long bill and bold emerald green back and rump eliminated Blue-throated.
Previous experience with this & similar species:	Yes, many in Arizona and Mexico and also many Blue-throated Mountain-Gem as well in AZ and MX
References consulted:	Sibley app, Macaulay Library
Description from:	From photo(s) taken at the time of the sighting
Observer:	Bryant Olsen
Observer's address:	84102
Observer's e-mail address:	**
Other observers who independently identified this bird:	1st seen by Lee Burke on 6/28/24 at 5:30pm, photos sent to me to help ID, relocated by Lee on 7/2, many saw the bird on 7/3 including Matt Pendleton, Felicia Alvarez, Stephany Weems, Dave Hanscomb, Margaret Sloan, Jon Manwaring, Dave Hanscom and Lee Burke with me, also seen earlier on 7/3 by Kris Purdy, David Wheeler, Lauri Taylor.
Date prepared:	7/4/24
Additional material:	Photos
Additional comments:	My eBird checklist: https://ebird.org/checklist/S185183707 Lee's list from 7/2: https://ebird.org/checklist/S185029374