Cooperative hunting in birds

[cowen@geology.ucdavis.edu]

Tony Fiorillo is right: it is the Harris's hawk that hunts cooperatively,
with a group flushing and then killing jackrabbits in the Southwest. By
hitting the jackrabbit from a particulat direction, a hawk can kill an
animal that weighs more than it does - but that kill has to be set up by
the harassment of the hunting partners. The whole group of hawks then gets 
to feed on a relatively huge chunk of meat.
This was written up in Science, but I don't have the reference in front of
me. I remember it because it had a beautiful photo of a H.h. on the cover.
Maybe 1989?

Richard Cowen