Heermann's gull (Larus heermanni) adult with egg, Isla Rasa, Gulf of California (Sea of Cortez), Mexico, North America

Heermann's gull (Larus heermanni) nest with egg, Isla Rasa, Gulf of California (Sea of Cortez), Mexico, North America

Cape gull (Larus vetula) with African penguin (Spheniscus demersus) egg, Boulders Beach, Simons Town, South Africa, Africa

Nazca booby (Sula grantii) downy chick in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult kelp gull (Larus dominicanus) with stolen Adelie penguin egg in its bill at Brown Bluff, Antarctica, Polar Regions

Heermann's gull (Larus heermanni), egg clutch detail at breeding colony on Isla Rasa, Baja California, Mexico, North America

A herring gull chick pecking its way out of the egg using its egg tooth on the end of its beak

Lesser black backed gulls nesting on Walney Island near Barrow in Funress, Cumbria, England, United Kingdom, Europe

Lesser black backed gulls nesting on Walney Island near Barrow in Funress, Cumbria, England, United Kingdom, Europe

Herring Gull eggs (Larus argentatus). Grande Moie, Sark, British Channel Islands

Lesser black backed gulls nesting on Walney Island near Barrow in Funress, Cumbria, England, United Kingdom, Europe

A lesser black backed gull's nest on Walney Island near Barrow in Funress, Cumbria, England, United Kingdom, Europe

On nest eating egg of Black-browed albatross (Thalassarche melanophris). Falkland Skua or Brown Skua (Stercorarius antarcticus, exact taxonomy is under dispute). They are the great skuas of the southern polar and subpolar region. South America, Falkland Islands, January

Gull egg in nest, Brier Island, Nova Scotia, Canada

Belcher's gull with egg, Pescadores guano island Peru