Sven Zacek / Black woodpecker (Dryocopus martius) excavating nest hole. Valgamaa, Southern Estonia. April.
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Pete Oxford / American Crocodile (Crocodylus acutus) nest excavated by nesting female Green Iguana (Iguana iguana), Banco Chinchorro, Yucatan Peninsula, Mexico
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Georgette Douwma / Termites excavating corridor in wood {Isoptera} Bunaken, Sulawesi, Indonesia
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David Tipling / Melanesian megapode (Megapodius eremita) female excavating nest chamber to lay egg. Savo Island, Solomon Islands.
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David Tipling / Melanesian megapode (Megapodius eremita) female excavating nest chamber to lay egg. Savo Island, Solomon Islands.
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David Tipling / Melanesian megapode (Megapodius eremita) female excavating nest chamber in sand to lay egg. Savo Island, Solomon Islands.
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David Tipling / Melanesian megapode (Megapodius eremita) female excavating nest chamber in sand to lay egg. Savo Island, Solomon Islands.
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Nick Upton / Black oil beetle (Meloe proscarabaeus) female excavating a nest burrow in coastal grassland, north Cornwall, UK, April.
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John Cancalosi / Great horned owl (Bubo virginianus) and chicks on nest. Gilded flicker (Colaptes chrysoides) excavating nest. On Saguaro (Carnegiea gigantea) cactus, Sonoran desert, Arizona, USA.
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Marie Read / Pileated woodpecker (Dryocopus pileatus) male excavating in search of food, New York, USA. Digital composite.
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Sven Zacek / Black woodpecker (Dryocopus martius) male excavating nest hole in Aspen (Populus tremula) trunk. Tartumaa, Southern Estonia. April. Composite image.
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Ashley Cooper / Digger excavating lake bed to try and find water during drought, Hong Hai Zai, Inner Mongolia, China. March 2009.
