Nigel Cattlin / Insect / invertebrate house / bug hotel with various refuge options for hiding / over-wintering, WWT, West Sussex, UK, July.

Nick Upton / Red mason bees (Osmia bicornis) entering and leaving nest hole drilled into a log within an insect hotel, Gloucestershire, England, UK, April.

Neil Lucas / Camerman Doug Allan at frozen water surface of drilled ice hole, BBC film crew, McMurdo Sound, Ross Sea, Antarctica, November 2008

Marie Read / Red-breasted sapsucker (Sphyrapicus ruber) adult feeding on tree sap from shallow wells it has drilled in bark of Curl-leaf Mountain-mahogany (Cercocarpus ledifoius), Lee Vining Canyon, California, US...

Nick Upton / Horse's hoof / Tinder fungus (Fomes fomentarius) growing on a rotten Downy birch (Betula pubescens) tree trunk which a woodpecker has drilled a hole into, Muraka Forest reserve, Estonia, April

Markus Varesvuo / Black woodpecker (Dryocopus martius) on birch tree trunk with drilled hole, feeding on bracket fungus (Piptoperus betulinus) tongue visible, Helsinki, Finland, February.

Nick Upton / Wood pigeon (Columba palumbus) foraging for wheat seeds in a recently drilled field, Cornwall, UK, April.

Nick Upton / Wood pigeon (Columba palumbus) foraging for wheat seeds in a recently drilled field, Cornwall, UK, April.

Hermann Brehm / Lineated Woodpecker (Dryocopus lineatus) foraging for insects with tongue in hole drilled in wood, Pantanal Brazil

Jeff Foott / Saw dust (frass) at base of Lodgepole Pine tree trunk where Mountain pine beetles (Dendroctonus ponderosae) have drilled through the bark.Resin / pitch indicate the beetles' entry holes. Grand Teton N...

Nick Upton / Insect hotel with drilled logs and bundles of bamboo stems, some with partially completed mud nests of Mason wasps wasps (Ancistrocerus sp), garden, Gloucestershire, UK, May.

Nick Upton / Red mason bee (Osmia rufa) male wating for females to emerge from nest holes in a drilled log within an insect hotel, Gloucestershire garden, UK, April.

Nick Upton / Red mason bee (Osmia rufa) male wating for a female to emerge from a nest hole in a drilled log within an insect hotel, Gloucestershire garden, UK, April.

Nick Upton / Insect hotel with a variety of crevices among broken pottery, drilled logs and wooden blocks, Gloucestershire, UK, April.

Nick Upton / Insect hotel with drilled logs, bundles of bamboo stems and lichen-covered bracnhes, Gloucestershire garden, UK, April.

Nick Upton / Mason wasp / Potter wasp (Ancistrocerus sp.) inspecting a nest hole in a drilled log within an insect hotel, Gloucestershire garden, UK, April.

Nick Upton / Red mason bee (Osmia rufa) female emerging from her nest hole in a drilled log within an insect hotel after provisioning a brood cell with pollen, Gloucestershire garden, UK, April.

David Woodfall / Nest sites for solitary bees, drilled into logs, Chepstow, Wales, UK August.

David Woodfall / Nest sites for solitary bees, drilled into logs, Chepstow, Wales, UK August.

Jussi Murtosaari / White-backed woodpecker (Dendrocopos leucotos) male on heavily drilled tree, Laukaa, Keski-Suomi, Lansi- ja Sisa-Suomi / Central and Western Finland, Finland. February

Philippe Clement / Man-made 'insect hotel' offering artificial nesting facilities for solitary bees and cavities for hibernating ladybirds and other insects. Made from reed and bamboo stems, drilled holes in woodblocks,...

Ernie Janes / Cocker Spaniel retrieving cock pheasants (Phasianus colchicus) during pheasant shooting, in drilled barley field, Essex, November

Ann & Steve Toon / Black rhino horn, (Diceros bicornis) from a female called Etna that died naturally in captivity at Port Lympne zoo in the UK, is drilled to collect DNA samples for research into population genetics an...

Ann & Steve Toon / Black rhino horn, (Diceros bicornis) from a female called Etna that died naturally in captivity at Port Lympne zoo in the UK, is drilled to collect DNA samples for research into population genetics an...

Doug Allan / Wildlife cameraman Doug Allan prepares for a dive in hole drilled in sea ice. Ross Sea, McMurdo, Antarctica. Freeze frame book plate page 38.

Jack Dykinga / Cenote Dzul-Ha, sink hole, light passing through hole drilled by Hacienda workers to access water below, Yucatan, Mexico. October 2009

Neil Lucas / Looking down on Doug Allan climbing out through frozen water from drilled ice-hole in sea ice, underwater filming for BBC Life series, McMurdo Sound, Ross Sea, Antarctica, November 2008

Neil Lucas / Ladder leading down into drilled ice-hole for BBC filming, McMurdo Sound, Ross Sea, Antarctica, November 2008

Gary K. Smith / Arable field with with freshly drilled Carrot beds, Norfolk, UK, April

Gary K. Smith / Arable field with with freshly drilled Carrot beds, Norfolk, UK, April

Gary K. Smith / Arable field with with freshly drilled Carrot beds, Norfolk, UK, April

John Cancalosi / Red-naped Sapsucker (Sphyrapicus nuchalis) on tree trunk where rows of shallow holes have been drilled in the tree bark over a period of years to drink sap and feed on insects, Montana, USA

Pete Oxford / Black Rhinoceros (Diceros bicornis) horn being drilled to allow radio transmitter antenna to protrude, Great Karoo, South Africa

Pete Oxford / Black Rhinoceros (Diceros bicornis) horn being drilled for radio transmitter, Great Karoo, South Africa

Pete Oxford / Black Rhinoceros (Diceros bicornis) horn being drilled to allow radio transmitter antenna to peek through, Great Karoo, South Africa

Nick Upton / Home-made insect hotel with a range of Bamboo stems and drilled hole sizes for different species, with many completed nests of Wood-carving leafcutter bees (Megachile ligniseca) and a variety of Potte...

Nick Upton / Two Wood-carving leafcutter bees (Megachile ligniseca) entering hand-made insect hotel, showing a range of bamboo stems and drilled hole sizes for different species, in garden, Wiltshire, UK. July.

John Waters / Eurasian hedgehog (Erinaceus europaeus) emerging from hole drilled into wall dividing urban gardens, part of initiative to create 'Hedgehog Highways' to increase accessibility of urban gardens to hedg...

Phil Savoie / Little yellow-faced bee (Hylaeus pictipes), 3.5mm average size, one of the smallest bees in the UK, nesting in 1mm holes drilled in bee hotel, Monmouthshire, Wales, UK, July.

Phil Savoie / Little yellow-faced bee (Hylaeus pictipes), 3.5mm average size, one of the smallest bees in the UK, nesting in 1mm holes drilled in bee hotel, Monmouthshire, Wales, UK, July.

Phil Savoie / Little yellow-faced bee (Hylaeus pictipes), 3.5mm average size one of the smallest bees in the UK, nesting in 1mm holes drilled in bee hotel, Monmouthshire, Wales, UK, July.

Phil Savoie / Little yellow-faced bee (Hylaeus pictipes), 3.5mm average size, one of the smallest bees in the UK, nesting in 1mm holes drilled in bee hotel, Monmouthshire, Wales, UK, July.

Phil Savoie / Little yellow-faced bee (Hylaeus pictipes), 3.5mm average size, one of the smallest bees in the UK, nesting in 1mm holes drilled in bee hotel, Monmouthshire, Wales, UK, July.

Phil Savoie / Little yellow-faced bee (Hylaeus pictipes), 3.5mm average size, one of the smallest bees in the UK, nesting in 1mm holes drilled in bee hotel, Monmouthshire, Wales, UK, July.

Phil Savoie / Little yellow-faced bee (Hylaeus pictipes), 3.5mm average size, one of the smallest bees in the UK, nesting in 1mm holes drilled in bee hotel, Monmouthshire, Wales, UK, July.

Phil Savoie / Little yellow-faced bee (Hylaeus pictipes), 3.5mm average size, one of the smallest bees in the UK, nesting in 1mm holes drilled in bee hotel, Monmouthshire, Wales, UK, July.

Phil Savoie / Little yellow-faced bee (Hylaeus pictipes), 3.5mm average size, one of the smallest bees in the UK, nesting in 1mm holes drilled in bee hotel, Monmouthshire, Wales, UK, July.

Phil Savoie / Little yellow-faced bee (Hylaeus pictipes), 3.5mm average size, one of the smallest bees in the UK, nesting in 1mm holes drilled in bee hotel, Monmouthshire, Wales, UK, July.

Philippe Clement / Insect hotel for solitary bees and artificial nesting place for insects / invertebrates offering nest holes / cavities in hollow stems and wood blocks