Fish Crows, by the sound of them, harrying the male American Kestrel.
They did not seem to be making much of an impression.
In other media, I didn’t do one of my listening tours this year because of you know what, but I did talk to WNYC’s Amy Pearl about listening to nature.
Backyard and Beyond 
Loved the interview! Thanks for sharing it.
I am out in Van Cortlandt Park sometimes and see more wildlife activity in the woods than before. So many chipmunks! It is really nice to see.
The American Kestrel doesn’t seemed phased at all! Great pictures. Looking forward to reading more of your posts.
Do harrying crows ever sink their beaks or talons in their target? Or would that just escalate the conflict with a much more powerful opponent?
I don’t know the answer re: crows specifically. Certainly possible:
Have seen Blue Jays and Mocking Birds clip hawks and even eagles; Red-winged Blackbirds have been photographed riding on the back of raptors; etc.