The Trumpeter Swan (Cygnus buccinator), endemic to North America and its largest species of waterfowl, approached extinction in the 1930s (Banko 1960). But by 2015, following nearly a century of conservation, its population had rebounded to some 63,000 wild birds (Groves 2017). Enhanced population size has provided increased opportunity for scientific study, and previously unreported behaviors now are being observed. Here we report egg retrieval—the act of a bird moving eggs from outside the nest bowl into the nest bowl—by nesting Trumpeter Swans for the first time. Egg retrieval is an important behavior that serves to restore reproductive opportunity after disturbance at the nest.