Western Gull
(Larus Occidentalis)
Photographed in Marin Headlands, California by Jim Rosso

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Four Western Gulls are vocalizing as a group.
But on further observation there seems to be two pairs.
The vocalization is periodically interrupted by mutual billing amongst the pairs.
And then a return to the vocalization.
And then a return to behavior among the two couples.
It ends with a short fight from which everybody flies away.