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Cooperative hunting in birds
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.