This academic work explores the physics of flocking and active matter, focusing on developing hydrodynamic models to describe the collective motion of large groups. It utilizes the concept of universality and the powerful method of the Dynamical Renormalization Group (DRG) to understand the long-distance, long-time behavior of these systems. The text examines different types of flocks, including "dry" and "Malthusian" (with birth and death), and draws parallels to other physical phenomena like the Mermin-Wagner-Hohenberg theorem and the KPZ equation to explain the underlying principles and mathematical techniques used.

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