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Geeky pigeons...



<http://www.nytimes.com/2011/12/23/science/pigeons-can-learn-higher-math-as-well-as-monkeys-study-suggests.html>

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.