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This confirms that tyrannosaurids could count well enough to know when
the hadrosaurs were being rustled from their herds.
Still open is the question of whether or not they hired smaller
theropods to work as herd guards, but given the lack of arboreal
adaptations/co-options in hadrosaurs, combined w/ the fact that water is
wet, it would seem to be a done deal until someone says otherwise.