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Checklist S12606519

 
Location
Pueblo Reservoir, Pueblo County, Colorado, US ( Map ) ( Hotspot )
Date and Effort
Sun Jan 28, 2007 9:00 AM
Protocol:
Traveling
Party Size:
4
Duration:
3 hour(s)
Distance:
6.5 mile(s)
Observers:
Steven Mlodinow
Comments:
N/A
Species
40 species (+2 other taxa) total
X
X
X
X
X
X
X
1
X
X
X
1
Common Goldeneye x Hooded Merganser (hybrid)

staked out

X
X
X
4
25
6
1
8
1
3500
80
3
1

Around 9:30 am on 28 January 2007, Tony Leukering, Brandon Percival, Bill Tweit, and I were sorting through a fair sized flock of gulls on the ice at Pueblo Reservoir. Tony and Brandon had mentioned that a likely Iceland Gull had been seen here recently. Scanning the flock, I noticed a pale tan gull sleeping on the ice. Zooming in on it, I noticed broad pale edges to the folded primaries and fully barred tertials and got the others on the bird. Overall, we watched the bird for about 20 minutes at about 200 yards. Eventually it woke up, stood up, and then flew away. The lighting was bright and from the side, giving great views of wings but the back pattern/color was a bit difficult to discern.
This bird was smallish for a ¿big gull,¿ distinctly smaller than the nearby Herring Gulls and approximately the size of a nearby California Gull. It was fairly long winged appearance. Its head was delicate and ¿cute¿ with a bit of a peak towards the rear of the crown. The bill was short and thin, mostly black, with a pale base (limited to the basal quarter or less of the bill). The eye was dark. This gave the bird an almost Mew-gull like ¿feel¿ to it.
The chest and belly were a dull pale brown. The vent was pale to medium brown and white. The underside of the tail seemed barred similarly brown and white, without any solid patch of brown. The wing coverts were a slightly darker brown than the underparts and heavily speckled with white or whitish. In the tertials, this brown and whitish pattern gave the appearance of light to medium brown bars alternating with near-white bars. There was no areas of solid brown on tertials. The folded primaries were coffee colored with moderately wide whitish borders. The back appeared a solid grayish brown (or brownish gray). The head was brown, overall similar in color to the underparts. The area around the eye and towards the rear-crown/nape was a bit darker and the area around the base of the bill was a bit paler (not dissimilar to what is shown for both ¿paler juvenile¿ Thayer¿s and ¿darker juvenile¿ Iceland in Sibley¿s guide).
In flight, I was unable to clearly see the tail or rump. The wings were very uniform and appeared nearly white in the bright light. The bird clearly lacked a secondary bar.
The uniform wings (lacking secondary bar), completely mottled/marked tertials eliminate Thayer¿s Gull. The very delicate head, quite small bill, and small size would be extreme for Thayer¿s, and make me think this was a small female ICGU. Similarly, the amount of pale edging to the primaries (folded) would be highly unusual for THGU and I¿ve never seen a THGU that looked to have no dark on primaries, above or below in flight.

5
2

2 adults

4
1
X
X
X
1
X
X
X
X
X
X
X
X
X
 

Are you submitting a complete checklist of the birds you were able to identify?

Yes