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.