Description: Creagrus furcatus Swallow-Tailed Gull resting at a breeding colony on Isla de Plazas Sur off the eastern coast of Santa Cruz island, Galapagos Islands, Ecuador - Aug 1999. Date: 1 August 1999, 00:00. Source: Swallow-Tailed Gull Uploaded by berichard. Author: Victor Burolla from Alameda, CA, USA.