Saw this pretty little guy at Delta Ponds. I think they could now be gone for the season.

Found this interesting tidbit at "All About Birds" - https://www.allaboutbirds.org/guide/Yellow-rumped_Warbler/id# - "Yellow-rumped Warblers typically forage in the outer tree canopies at middle heights. They're active, and you'll often see them sally out to catch insects in midair, sometimes on long flights. In winter they spend lots of time eating berries from shrubs, and they often travel in large flocks."