Birds are the most diverse land vertebrate on the planet, and now scientists have constructed a complete evolutionary tree of the 11,000 or so known species. This data is now part of the Open Tree of Life (OpenTree) project—a collaboration between evolutionary biologists and taxonomists which aims to construct the evolutionary history of all known species on the planet. After combining additional data on the 1,800 or so species not included in these studies, the team formed a complete map of avian evolutionary history. “People publish scientific papers about birds’ evolutionary relationships all the time. Crucially, similar techniques used to construct this evolutionary tree can be applied to other groups of species as well, slowly revealing the incredible and inter-related animal diversity that spans the globe.