Dark Corner Vigil is a set of documents that will likely serve as a record of life lost to the Anthropocene. It is about the local and individual consequences of that loss: the gradual disappearance of swarms of fireflies from our family farm in Tennessee. It describes population density and behavior. It tracks those over time. The precision required for this work makes process evident in the outcome, and the revelation of process has implications about how we describe, abstract, and attempt to understand the natural world. At heart, it is my attempt to understand the language of another species before it disappears from my view.