Sunbitterns (Eurypyga helias) are not social birds, so they are often difficult to locate in the wild. Sunbitterns are relatively quiet, but they are able to make a mechanical rattling sound. As a sunbittern spreads its wings, a patch of chestnut and orange appears on the primary wing feathers and across the tail. This display is primarily used as a threat or defense rather than courtship and is typically accompanied by a low hiss and bowing. These birds catch their prey by striking quickly, using their long neck and spear-like bill.