In May 2019, a biologist with the South Carolina Department of Natural Resources made a monumental discovery: 20,000 Eurasian curlews (a threatened and rapidly declining migratory shorebird) roosting together in a single flock on Deveaux Bank, a treeless sandbar 20 miles south of Charleston. This spectacle—a flock that represented half of the species’ entire Atlantic Flyway population—hid in plain sight, gathering each night during spring migration. Dr. J. Drew Lanham gives his perspective on this monumental discovery.