Bats navigate and hunt in total darkness using echolocation, a discovery credited to Harvard zoologist Donald Griffin, who first described the ability in the 1940s. This film traces that history and follows the researchers who have built on his work, using infrared and high-speed cameras to catch behaviors too fast or too dark for the naked eye, from precise wing maneuvers to social interactions inside roosts. A set of 3-D graphics reconstructs what a bat's acoustic vision might actually look like, translating echo returns into a visual map of prey and obstacles moving through the night. The footage ranges from rainforest canopies in Central America to arid stretches of the Australian outback, showing how differently bats have adapted to hunt insects, fruit, and in some cases small vertebrates depending on habitat. Along the way the film addresses common myths about bats and points to their function in pollination and insect control, the practical reason ecologists care about populations that are otherwise easy to overlook or fear.