(above, Arctic Warbler, via wikipedia.com)
Joey (in New York, NY), at least 10 accepted California records exist for the Dusky Warbler, per the judgment of the California Bird Records Committee. The same committee has agreed that at least four past Arctic Warbler sightings are valid.
A good book to obtain for “hovering and gleaning” this information:
Rare Birds of California. 2007. Western Field Ornithologists. See: westernfieldornithologists.org
(Updates for new accepted records are online at: