Roger Powell / Black-headed gull (Larus ridibundus) in flight, Amble, Northumberland, UK. June.

Roger Powell / Black-headed gull (Larus ridibundus) walking through a tidal pool on the beach, Amble, Northumberland, UK. June.

David Pattyn / Black-headed gull (Chroicocephalus ridibundus) calling in shallow pond on misty morning, Valkenhorst Nature Reserve, The Netherlands, August.

David Pattyn / Black-headed gull (Chroicocephalus ridibundus), Valkenhorst Nature Reserve, The Netherlands, August.

Robin Chittenden / Black-headed gull (Larus ridibundus), Norwich, England, UK, March.

Oscar Dewhurst / Black-headed gull (Chroicocephalus ridibundus) walking along the shoreline. Durham, UK. December.