Thank you for your fast response!
Some of my pictures clearly show 2 Boat-tailed Grackles, but the ones I linked don't seem to match the description:
Boat-tailed Grackle: Large, black bird with a very long, keel-shaped
tail. Male is iridescent blue-black with yellow or brown eyes. Black
bill is slender and long. Legs and feet are gray. Forages walking on
ground and wading in water. Strong direct flight with rapidly beating
wings.
the bird was neither large, nor black (it was brown), legs and feet are dark brown /black, not gray.
Forgive a newbie his scepticism, but are you sure?
Cheers, Jan