[cobirds] Prewitt, Washington County, Gulls and a few other NE CO highlights.

Greetings All,

Yesterday's collection of gulls at Prewitt Reservoir (aka, The Great Dead Fish Fest), some seen alone, some with Glenn Walbek + Joe Roller, included the following:

* indicates present one week ago

100+ Herring Gulls*

10 Thayer's Gulls (some same, some different as last week as age-class mix different)

2 Lesser Black-backed Gulls (2nd year birds)*

6 Glaucous Gulls (adult, 3rd year*, 2nd year*, 3 first years*)

1 Glaucous-winged Gull (1st year) -- I didn't see this bird last week, but Glenn did. Tim Smart and I had a 2nd cycle bird last weekend.

1 Glaucous-winged x Herring Gull (1st year)*

1 Iceland Gulls (1st year) -- last week, Tim and I had a 2nd cycle and an adult; Glenn had a first year bird within the last week or two, which may have been this bird.

1 Western Gull: 3rd year? 2nd year transitioning into 3rd year? -- picture an adult Western Gull with solid black folded primaries, some brown on tertials and a bill both yellow and black.

-- and hundreds of RB Gulls.

The pond along Route 6, just w. of Prewitt, at intersection with Co Rd R, had a huge number of birds at dawn including:

2 pairs of GH Owls vocally challenging each other, one bird could be seen on nest.

1 calling LE Owl

100+ G White-fronted Geese (over 500 there later in day)

1800 Ross's Geese (INCLUDING ONE BLUE-MORPH!!!!!!!!)

1000 Cackling Geese

100 or so gulls, including 2 Thayer's Gulls.

At the northeast end of Jackson Reservoir, there was a Gadwall x Mallard hybrid (yes, another!), 2 White-winged Juncos, and my first Greater Yellowlegs of the spring. The place was virtually a gull-free zone.

Various spots east and south of Greeley had good numbers of birds but nada worthy of mention.

Good Birding

Steven Mlodinow

Longmont, CO

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