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Although human beings have known about the phenomenon of "flocking"- that is,the coherent movement of large numbers of creatures (flocks of birds, schoolsof fish, herds of woolly mammoths, etc.)- since prehistoric times, it is onlyin the last two decades that we have begun to truly understand this phenomenon.In particular, the surprising fact that a very large collection of organisms intwo dimensions cannot all {\it point} in the same direction, but can quiteeasily {\it move} in the same direction, can now be explained. In theselectures, I'll review one of the principle theoretical tools that made thispossible: hydrodynamics. My intention is both to elucidate flocking- or, to usethe specific technical mouthful, "polar ordered dry active fluids"-, and to useflocking as an illustration of how to use the hydrodynamic approach on new andunfamiliar systems.

Why walking is easier than pointing: Hydrodynamics of dry active matter