I spend three days at the Bird Atlass Bash at Vaalboskraal near Mareetsane in the North West Province. This was for SABAP2 (South African Bird Atlass Project ) It was real fun.
While atlassing pentad 2600_2535 and 2605_2535, I witness a spectacle where a Southern Pale Chanting Goshawk was being mobbed by Pied Crow at first, then a Black Shouldered Kite.
Birds normally mob an intruder who enters their territory by harrasing, intimidating and chasing off using the "dive-bombing" or "sally attacks" techniques. Protection of a territory. Here is the story
The Pale Chanting Goshawk just perched on a power line
(being in a wrong territory)
Along came a Black-shouldered Kite
Moved to another location for its own safety
But along came a Pied Crow this time