Gerrit Vyn / Glaucous winged gulls (Larus glaucescens) pair near their nest, St. Lazaria Island, Alaska, USA June

Robin Chittenden / Glaucous / Iceland winged gull (Larus glaucescens) Europe

Ingo Arndt / Glaucous-winged Gull (Larus glaucescens) dropping mussel from air to crack the shell and get the meat out, Lake Clark National Park, Alaska

Matthias Breiter / Glaucous-winged Gull (Larus glaucescens) catching herring, Craig, Alaska

Matthias Breiter / Glaucous-winged Gull (Larus glaucescens) catching herring, Craig, Alaska

Michael Quinton / Glaucous-winged Gull (Larus glaucescens) and chick, Alaska

Michael Quinton / Glaucous-winged Gull (Larus glaucescens) pair, Alaska

Michael Quinton / Glaucous-winged Gull (Larus glaucescens) pair, Alaska

Suzi Eszterhas / Glaucous-winged Gull eggs (Larus glaucescens) nest amongst driftwood debris, Katmai National Park, Alaska, USA, June 2008

Suzi Eszterhas / Glaucous-winged Gull (Larus glaucescens) chick sheltering against log, Katmai National Park, Alaska, USA, June

Michael Quinton / Grizzly Bear (Ursus arctos horribilis) and Glaucous-winged Gulls (Larus glaucescens) on riverbank, Alaska

Michael Quinton / Sea Otter (Enhydra lutris) feeding on Pink Salmon (Oncorhynchus gorbuscha) while gull waits for scraps, Prince William Sound, Alaska