This morning here in Fairfield I heard a bird by my barnyard whose call was utterly foreign to me. I've listened to the 40-odd regional birds on the Sibley app. that would be eligible with no luck. I saw it from 20 feet away or so and it looked like a crow in color, size and shape. I couldn't swear to black over midnight blue or purple, but it wasn't as light as brown and had no colored plumage that I could see- it was low to the ground and darting from tree to tree.
I didn't get a long enough look at it to figure out the tail pattern. The call was the weirdest part- it was 5 or six sounds of approximately middle C and then one a few notes down- maybe an A or G below middle C. Each C-note took about a second, and then the last one held for a few. They weren't trills, caws, cackles or any other standard birdlike sounds- it almost sounded like a throb or pulse. I would say 'drip' although a drip is usually a succession of two notes. It was very cool. Suggestions, birders royale?