3:37 pm
Wanted to pass along behavioral observation of a pair of tropical kingbirds courting and copulating this morning just after 9 am at Dairy Mart Ponds and the Dairy Mart Rd edge of the sod farm, venturing to speculate that it’s likely a first for San Diego County. Rick Grove, Nathan French, Martha Wild and I heard then observed one tropical kingbird and then a second (and later up to three Cassin’s kingbirds) foraging, perching, and interacting along the utility lines, willows, and giant reeds adjacent to the middle and south Dairy Mart ponds. Amid near-constant twittering vocalizations, the two tropical kingbirds landed on a utility line within inches of each other, flew apart, then repeated a few times, at times touching shoulders. While still vocalizing, they then proceeded to hop back and forth along the utility line, each with shoulders hunched, wings partially extended and quivering, flicking and flaring tail, then continuing and converging toward each other, and finally copulating. This may simply be an observation of late season over-wintering pair bond reinforcement, or it may be early courtship and breeding territory assertion as a precursor to possible expansion into Southern California (?).
Other rarities observed elsewhere in the Tijuana River Valley included continuing male Lawrence’s goldfinch at the community gardens (a couple of us thought we caught fleeting glimpse and Merlin app detected call at feeders in N central garden plot near 3 US flags, then we all had good looks of it at feeders in SE garden plot), female vermilian flycatcher on east ballfield fence at east end of Sunset Ave, and two common ground-doves in same general area (flew in from east, landed between concession trailers, then disappeared when dog and walker approached).
Rick will be posting results of today’s scouting trip for the upcoming Bird Festival to eBird, possibly including photos from he, Nathan, and/or Martha.
Robert Patton
San Diego, CA