Sven Zacek / Black woodpecker (Dryocopus martius) excavating nest hole. Valgamaa, Southern Estonia. April.

Kerstin Hinze / Male Black woodpecker (Dryocopus martius) drilling a hole in a tree, hunting for insects, Bavarian Forest National Park, Bavaria, Germany, February.

Bryan and Cherry Alexander / Sundogs (parhelia / parhelai) behind a 'Christmas tree' (valve assembly) in the South Tambey Gas Field, Yamal Peninsula, Siberia, Russia. February 2014.

Bryan and Cherry Alexander / A gas drilling derrick at sunset in the South Tambey Gas Field, Yamal Peninsula, Siberia, Russia. February 2014.

Bryan and Cherry Alexander / A 'Christmas tree' (valve assembly) in front of a gas drilling derrick in the South Tambey Gas Field, Yamal Peninsula, Siberia, Russia. February 2014.

Graham Eaton,Graham Eaton / A land drilling rig with casing prepared, ready to be run in to line the wellbore. Kenya

Steven Kazlowski / Trans-Alaskan Pipeline, with blooming fall tundra colours, that runs from Prudhoe Bay on the Arctic coast to Valdez at the north central coast of Prince William Sound, Alaska, USA

Mike Wilkes / Great spotted woodpecker (Dendrocopos major) pecking at bark, searching for bugs under the bark, Warwickshire, UK

Andy Sands / Acorn weevil (Curculio glandium) drilling hole in developing acorn in which to lay egg, UK, Captive, sequence 1/4

Nigel Cattlin / Winter wheat (Triticum aestivum) seedling roots establishing after direct drilling the crop. Berkshire, England, UK. Pinboard sampled specimens, studio shot.

Kerstin Hinze / Slow motion clip of a male Black woodpecker (Dryocopus martius) drilling a hole in a tree, hunting for insects, Bavarian Forest National Park, Bavaria, Germany, February.

Kerstin Hinze / Slow motion clip of a male Black woodpecker (Dryocopus martius) drilling a hole in a tree, hunting for insects, Bavarian Forest National Park, Bavaria, Germany, February.