[birdbrain]

The phenomenon of multiple prey animals swarming larger predators to drive them off is known as mobbing.[0] Crows seem to do it quite readily. Very cool that you got to see it!

[0] https://en.wikipedia.org/wiki/Mobbing_(animal_behavior)

[every]

I got to watch it in detail recently at our apartments. Starlings mobbed a hawk and drove it away several times...

[kulu2002]

Almost everyday a barn owl is being mobbed by crows. This owl then sits on our bathroom window because it feels safe there. I want to teach these crows lesson for their lifetime