All in the timing, as it was not around when Jim and I were there first thing this morning. Just got a better photo: (Thanks to Donald Pye for letting me post his photo).
(photo by Donald Pye)
Now I see the McArthur's had a Yellow-throated Warbler at the feeder! I've seen them at Rondeau, but....
As usual I'm in the wrong place at the right time!