The Carolina Parakeet, the Heath Hen, the Passenger Pigeon—when we contemplate how bird diversity has changed, we often focus on the handful of species we have lost entirely. But while we have yet to lose a single bird species to our rapidly changing climate, birds and other creatures are currently adapting and responding. Studying changing bird communities over decades to centuries, Dr. Tingley’s work demonstrates the complex ways that species are responding to climate change, often by shifting in space and traveling in time.