[cobirds] Possible Arctic Tern, Chatfield Douglas, Co.

Folks,

I spent some time studying an interesting sterna tern on the Chatfield sandspit this morning.  The bird is small, with a small dark bill, except a reddish center and inner bill.  In flight, the primaries were fairly uniform gray with white secondaries and secondary covert tips.  The tips of the primaries are dark.  There was no hint of a dark secondary bar.  Resting, the primaries look a tad darker than the mantle with pale outlines, but gray not black. I suspect the bird is a juvenile (see worn juvenile in Sibley's guide).  I will upload some photos later.

Glenn Walbek

Castle Rock, CO

Sent from my Verizon Wireless 4G LTE DROID

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