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Interesting crow behaviour

I don't know where this thread came from or what it's getting at, but one
of my PhD students and I have just witnessed what we believe to be
cooperative hunting by three crows (neither of us know whether this is
unusual, but we found it fascinating). We watched the battle between the
crows and a pair of magpies in the closed quadrangle of our department
building for about half an hour. Two crows harried the magpies and drew
them away from their nest while the third nipped in from a different
direction to steal eggs. It was difficult to tell in all the confusion, but
we definitely witnessed at least one "changeover" when stealer became decoy
and decoy became stealer. All six eggs were eventually taken. Pack hunting