Folkert Christoffers/ BIA / Mute Swan (Cygnus olor) on nest, Lower Saxony, Germany

Folkert Christoffers/ BIA / European Robin (Erithacus rubecula), Lower Saxony, Germany

Folkert Christoffers / Eurasian Kestrel (Falco tinnunculus) fledglings, Lower Saxony, Germany

Folkert Christoffers / Eurasian Kestrel (Falco tinnunculus) chicks in nest box, Lower Saxony, Germany

Folkert Christoffers / Eurasian Kestrel (Falco tinnunculus) chicks in nest box, Lower Saxony, Germany

Folkert Christoffers / Eurasian Blackbird (Turdus merula) mother feeding chicks in nest, Lower Saxony, Germany

Folkert Christoffers / Eurasian Blackbird (Turdus merula) chicks begging for food in nest, Lower Saxony, Germany

Folkert Christoffers / Eurasian Blackbird (Turdus merula) mother feeding chicks in nest, Lower Saxony, Germany

Folkert Christoffers / Eurasian Blackbird (Turdus merula) father feeding chicks in nest, Lower Saxony, Germany

Folkert Christoffers / Eurasian Curlew (Numenius arquata) chick, Yorkshire, England

Folkert Christoffers / Red Grouse (Lagopus scoticus), Yorkshire, England

Folkert Christoffers / Eurasian Kestrel (Falco tinnunculus) parent and chicks, Lower Saxony, Germany

Folkert Christoffers / Song Thrush (Turdus philomelos) feeding begging chick at nest, Lower Saxony, Germany

Folkert Christoffers / Barnacle Goose (Branta leucopsis) flock, Lower Saxony, Germany

Folkert Christoffers / Eurasian Blackbird (Turdus merula) feeding apple to juvenile, Lower Saxony, Germany

Folkert Christoffers / Great Spotted Woodpecker (Dendrocopos major) male, Lower Saxony, Germany

Folkert Christoffers / Eurasian Blackbird (Turdus merula) chicks in nest, Lower Saxony, Germany

Folkert Christoffers / Common Wood-pigeon (Columba palumbus), Lower Saxony, Germany

Folkert Christoffers / Eurasian Blackbird (Turdus merula), Lower Saxony, Germany

Folkert Christoffers / Northern Gannet (Morus bassanus) breeding colony on cliff, Bass Rock, Scotland, United Kingdom

Folkert Christoffers / House Sparrow (Passer domesticus) carrying caterpillars, Lower Saxony, Germany

Folkert Christoffers / European Greenfinch (Chloris chloris) feeding juvenile, Lower Saxony, Germany

Folkert Christoffers / Eurasian Jay (Garrulus glandarius) carrying acorn food, Lower Saxony, Germany

Folkert Christoffers / Eurasian Jay (Garrulus glandarius) carrying food, Lower Saxony, Germany

Folkert Christoffers/ BIA / Song Thrush (Turdus philomelos) parent bringing food to begging chicks, Lower Saxony, Germany

Folkert Christoffers, BIA / Eurasian Kestrel (Falco tinnunculus) female with chicks in nest box, Lower Saxony, Germany