SWMBO has confidently identified him as a Bronzed Cowbird.
He's been dominating the drinking/bathing containers, chasing off smaller birds and sometimes even the doves.
He has a fierce set of very large feet that serve him well.
The only other bird that will challenge him for a drink is a Mountain Bluejay.
He's perhaps a tad smaller but his screechy voice makes up for the size difference.
It's an interesting time here at the Catalyst's Bird Sanctuary.