Many animals engage with the world as part of a cohesive group, including flocks of birds, swarms of insects, and schools of fish. Collective behavior emerges from interactions amongst individuals, where each animal’s movements are influenced by the actions of their neighbors. My lab is interested in the perceptual and neural mechanisms regulating the decisions of individuals in collectives, using the small transparent glassfish (Danionella cerebrum) as a model system. Here I will discuss our work quantifying the schooling behavior of Danionella, methods for measuring and manipulating collective movement, the maturation of social behavior over development, and ongoing efforts to record neural activity from schooling fish.