Thursday, 26 September 2019

[cobirds] NE Colo Shorebirds

Yesterday morning I arrived at the south side of Jumbo Reservoir in Logan and Sedgewick Counties to find some shoreline. Nearly every body of water in SE Colo has been full, therefore seeing some mud flats was good. Easily visible were Least, Solitary, Stilt, Pectoral, Baird's, Semipalmated, and Western Sandpipers, Sanderling, Long-billed Dowitchers, Greater and Lesser Yellowlegs, and a Semipalmated Plover among a zillion Killdeer..

Backtracking to the south side of Prewitt Reservoir in Washington County (mud boots advised), there were much larger numbers of the above species (except Sanderling). Also Snowy Egrets, Common and Black Terns. I have several photos of a Black-bellied Plover standing next to what appeared to be an American Golden Plover, but juvenile Black-bellied is so similar, especially in the field vs. books with different light, postures, etc. I'm still working it out. 

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In favor of AGPL: fairly prominent supercilium giving the appearance of dark cap, wings look very long, definitely a warmer brown color wash than BBPL behind it. In favor of juv BBPL: bill looks a bit big, breast and belly appear dirty but the bird has white undertail coverts. I believe it's an AGPL, I'd welcome any thoughts.

Dan Stringer
Larkspur, CO

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