Dec. 29, Judy posted a video of Pied Crow, persistently pecking at and aggravating an injured Hooded Vulture. http://www.youtube.com/watch?v=SY8zZestS9I
I have seen them do the same thing to a healthy Ground Hornbill. There is a Hornbill video on my album page and you can see the Crow moving in on the Hornbill. The video stops, but the Crow continued to pester the Hornbill the same way, until he finally drove it off.
Does anyone know what motivates that behavior?