I had my FOS Yellow Warbler this morning at Walden. It was a male, flying from tree to tree near the end of the boardwalk, singing once from each tree it landed in, as if it were attempting to claim a territory. Later, there was a male Great-tailed Grackle in the same area, and a female in the tall grass near the house. There was a pair of Wood Ducks in the trees along the creek near the sewage plant discharge, likely nesting. A Say's Phoebe was on the sewage plant fence in the same area.
Other FOS birds for me this morning were House Wrens (several singing), Rough-winged Swallows, and Cowbirds.
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Dick Pautsch
427 Pearl St.
Boulder, CO 80302