Atlantic Puffin (Fratercula arctica) in its burrow on Skomer Island in July, a nature reserve off the coast of Pembrokeshire, Wales, United Kingdom, Europe

Magdalena Island, Magallanes Region, Punta Arenas, Chile, South America

Magdalena Island, Magallanes Region, Punta Arenas, Chile, South America

Magellanic penguin (Spheniscus magellanicus), Magdalena Island, Magallanes Region, Punta Arenas, Chile, South America

Magellanic penguin (Spheniscus magellanicus), Magdalena Island, Magallanes Region, Punta Arenas, Chile, South America

Magellanic penguin (Spheniscus magellanicus) in its nesting burrow, Patagonia, Chile, South America

Horned puffin (Fratercula arctica). Mating behaviour by nesting burrow. Hebrides, Scotland (RR)

Atlantic puffin (Fratercula arctica) sitting at entrance to burrow. Sumburgh Head, Shetland Islands, Scotland

A Manx shearwater emerging from its burrow at night on the mountains of the Isle of Rhum, Scotland, United Kingdom, Europe

Colourfully painted bird house at the Rosenheim 2010 State Garden Show, Rosenheim, Bavaria, Germany, Europe

Tawny owl (Strix aluco) in front of its burrow, Hesse, Germany, Europe

Tawny owl (Strix aluco) in front of its burrow, Hesse, Germany, Europe

Atlantic Puffin (Fratercula arctica) in a puffinry on Mykines, part of the Faroe Islands in the North AtlanticDenmark, Northern Europe

Landing in a colony. Atlantic Puffin (Fratercula arctica) in a puffinry on Mykines, part of the Faroe Islands in the North Atlantic, Denmark, Northern Europe

Atlantic Puffin (Fratercula arctica) in a puffinry on Mykines, part of the Faroe Islands in the North Atlantic. Catch of fish sandeel in its beak, Denmark, Northern Europe

Atlantic Puffin (Fratercula arctica) in a puffinry on Mykines, part of the Faroe Islands in the North Atlantic. Catch of fish (sandeel) in its beak, Denmark, Northern Europe

Atlantic Puffin (Fratercula arctica) in a puffinry on Mykines, part of the Faroe Islands in the North Atlantic, Denmark, Northern Europe

Atlantic Puffin (Fratercula arctica) in a puffinry on Mykines, part of the Faroe Islands in the North Atlantic, Denmark, Northern Europe

Atlantic Puffins nesting on cliff, British Isles

Sand Martin landing to nest burrow, Finland

Young Sand Martins landing to nest burrow, Finland

European Bee-eater (Merops apiaster) adult bringing a bumblebee to the nest , May, South France

Big colony of the bee-eaters (Merops apiaster) in their burrows on a clay wall. Africa. Uganda.

Southern Carmine Bee-eater (Merops nubicoides), on the cliff of the Luangwa river, Luangwa river, South Luangwa natioinal Park, Zambia,

Southern Carmine Bee-eater (Merops nubicoides), on the cliff of the Luangwa river, a white-fronted bee-eater (Merops bullockoides) hold the tail' feathers, Luangwa river, South Luangwa natioinal Park, Zambia, Africa

Southern Carmine Bee-eater (Merops nubicoides), on the cliff of the Luangwa river, Luangwa river, South Luangwa natioinal Park, Zambia

Southern Carmine Bee-eater (Merops nubicoides), on the cliff of the Luangwa river, Luangwa river, South Luangwa natioinal Park, Zambia, Africa

Atlantic Puffin nesting on cliff, British Isles

Big colony of the bee-eaters (Merops apiaster) in their burrows on a clay wall. Africa. Uganda.

Sandwich Terns and Puffins in flight, British Isles