It was already evening at the outlet of the Gülper See into the Havel. The air was filled with the calls of migrating water birds. A white-headed gull sat on a boat bollard. In addition to the familiar sight of swans and ducks, this gull caught my attention. The first thing I noticed were its… Continue reading A putative Hybrid Herring x Caspian Gull at Lake Gülpe in Brandenburg: A Detailed Observation