Explore the second lecture in the "Dynamics of Biological Systems" summer course series, delivered by Dr. Akshit Goyal from the International Centre for Theoretical Sciences. Dive into the application of physics tools to explain complex living systems' behaviors. Learn about predator-prey population oscillations, multi-species ecosystem chaos, and microscopic organism swimming. Gain insights into modeling and predicting phenomena such as species competition, population catastrophes, bacterial motility, and collective behavior in fluidic environments using principles from nonlinear dynamics, statistical physics, and fluid dynamics. Designed for undergraduates with no prior biological knowledge, this pedagogical lecture introduces key concepts in biological physics over the course of 1 hour and 41 minutes.