Female mute swan asleep on nest of moss and twigs, Donnington, Gloucestershire, The Cotswolds, England, United Kingdom

Four golden eggs in a nest

Four golden eggs in a nest

Four golden eggs in a nest

White stork (Ciconia ciconia) adult collecting nest material on Narew marshes in spring, Podlaskie, Poland.

A blackbirds nest with four eggs

Two Puffins (Fratercula arctica), standing in the grass, bird rock Latrabjard, Westfjords, Iceland, Europe

Puffin (Fratercula arctica), standing in the grass, bird rock Latrabjard, Westfjords, Iceland, Europe

Puffin (Fratercula arctica), standing on grass, calling, bird rock Latrabjard, Westfjords, Iceland, Europe

Puffin (Fratercula arctica), standing in the grass, bird rock Latrabjard, Westfjords, Iceland, Europe

Two Puffins (Fratercula arctica), standing in the grass, bird rock Latrabjard, Westfjords, Iceland, Europe

Puffin (Fratercula arctica), standing in the grass, bird rock Latrabjard, Westfjords, Iceland, Europe

Sandhill crane (Grus canadensis) migrating north in late April to nesting grounds in Alaska, cries out from a farmer's field in Palmer, Alaska. Located in the Matanuska Valley, Palmer was founded as an agricultural colony in the mid-20th century, Palmer, Alaska, United States of America

House Sparrow and twigs to the nest, Alsace France