Very angry mob
The red-tail in question:
https://www.inaturalist.org/observations/194681775
Prices Fork Research Center screech
ID'd based on call.
Possibility of a beaver in Virginia Tech Duck Pond first suggested by Gabriel Cambridge.
See concurrent observation: https://www.inaturalist.org/observations/193000568
On P. serotina
Two ravens. Heard calling before they flew overhead.