Dave Bevan / Juvenile Herring gull (Larus argentatus) pecking a suckling Grey seal (Halichoerus grypus) pup, Norfolk, England, UK. December.

Espen Bergersen / Kittiwakes (Rissa tridactyla) squabbling on ice. Svalbard, Norway. July

Marie Read / Royal terns (Sterna maxima) pair crossing bills during courtship behaviour, Fort DeSoto Park, Florida, USA

Claudio Contreras / Heermann's Gull (Larus heermanni) in flight, Ensenada, Baja California Peninsula, Mexico, December.

Mary McDonald / Flock of Gray-headed Gulls (Chroicocephalus cirrocephalus) flying over Lake Nakuru, Kenya, East Africa

Gerrit Vyn / Flock of Heermann's Gulls (Larus heermanni) standing on intertidal rocks. Jefferson County, Washington, USA, August.

Dietmar Nill / Grey heron (Ardea cinerea) with fish being attacked by Gull, Germany, winter

Mark Bowler / Large flock of roosting Grey gulls (Leucophaeus modestus) on beach with coastal fog over the Atacama Desert on the Peruvian coast, Paracas National Park, Peru.

Marie Read / Royal tern (Sterna maxima) perching on a sand castle on a beach, Fort De Soto Park, St. Petersburg, Florida, USA, March.

Nick Hawkins / Lava gull (Larus fuliginosus) on beach. Isabela Island, Galapagos.

Bernard Castelein / Grey-headed gull (Larus cirrocephalus) in flight, Tanji, Gambia.

Bernard Castelein / Grey-headed gull (Larus cirrocephalus) in flight, Tanji, Gambia.