Lucky you having those Yellow-headed Blackbirds! I’ve never seen one before as they are rare in Central Massachusetts, but they are just gorgeous birds.
The only birds the Peregrines get in the city are normally the pigeons but I’ve seen the falcons at Plum Island and you are right in the fear they strike in waterfowl. It went from peach and quiet to bird hysteria. So fun to watch though!
Well, maybe, Lol!
They are the worst "sounding" birds in North America. Their song is sort of a scream/guttural choke/wheeze/screech.
Truly, it is the the most horrible sound in birddom, even worse than a cactus wren or a barn owl.
But ya gotta love 'em for that.