SINCLAIR STAMMERS / Well preserved fossil of trilobite Dudley locust (Calymene blumenbachii) from the Silurian period, found in the Wenlock Limestone of Wrens Nest Hill, Dudley, Worcestershire.

Andy Rouse / 2020VISION / Wren (Troglodytes troglodytes) singing with tail cocked from new pine growth. Wales, May.

Stephen Dalton / European wren (Troglodytes troglodytes) feeding young at nest in garden shed. Spring, UK

Shattil & Rozinski / Longbilled marsh wren {Cistothorus palustris} singing on bullrushes while 'doing the splits', Colorado, USA

Rolf Nussbaumer / Bewick's wren with nest material {Thryomanes bewickii} Texas, USA

Rolf Nussbaumer / Cactus wren on yucca {Campylorhynchus brunneicapillus} Texas, USA

Hermann Brehm / Wren (Troglodytes troglodytes) fledgling begging for food as parent offers grasshopper, Germany, July

Hermann Brehm / Wren (Troglodytes troglodytes) portrait, Germany, April

Hermann Brehm / Wren (Troglodytes troglodytes) looking out of nest, Germany, April

David Welling / Bewick's wren (Thryomanes bewickii) perched on a twig in Kern County, California, United States, March

David Welling / Bewick's wren (Thryomanes bewickii) perched on a twig in Kern county, California, United states

SINCLAIR STAMMERS / Well preserved fossil of trilobite Dudley locust (Calymene blumenbachii) from the Silurian period, found in the Wenlock Limestone of Wrens Nest Hill, Dudley.

SINCLAIR STAMMERS / Well preserved fossil of trilobite Dudley locust (Calymene blumenbachii) from silurian period, found in the Wenlock Limestone of Wrens Nest Hill, Dudley.

SINCLAIR STAMMERS / Well preserved fossil of trilobite, Dudley locust (Calymene blumenbachii) rolled in defensive position, from Silurian period, found in the Wenlock Limestone of Wrens Nest Hill, Dudley.

SINCLAIR STAMMERS / Well preserved fossil of trilobite, Dudley locust (Calymene blumenbachii) rolled in defensive position, from Silurian period, found in the Wenlock Limestone of Wrens Nest Hill, Dudley.

SINCLAIR STAMMERS / Well preserved fossil of trilobite Dudley locust (Calymene blumenbachii) from the Silurian period, found in the Wenlock Limestone of Wrens Nest Hill, Dudley.

Markus Varesvuo / Wren (Troglodites troglodites) profile portrait, Uto Finland Nevember

Markus Varesvuo / Wren (Troglodytes troglodytes) Uto Finland September

Markus Varesvuo / Wren (Troglodytes troglodytes) profile portrait, Helsinki Finland June

Marie Read / Bewick's Wren (Thryomanes bewickii) portrait. Mono Lake Basin, California, USA, April.

Marie Read / Bewick's Wren (Thryomanes bewickii) portrait. Mono Lake Basin, California, USA, April.

Marie Read / Bewick's Wren (Thryomanes bewickii) perched with cocked tail. Mono Lake Basin, California, USA, April.

Marie Read / House Wren (Troglodytes aedon), male singing, with Wild Columbines in the background, New York, USA

Claudio Contreras / Yucatan Wren (Campylorhynchus yucatanicus), Ria Lagartos Biosphere Reserve, Yucatan Peninsula, Mexico, August.

Alan Williams / Wren (Troglodytes troglodytes) singing on branch over a hedge on farmland, Cheshire UK May

Tui De Roy / Rufous wren (CInnycerthia unirufa) Yanacocha Reserve, Jocotoco Foundation, 3,200m altitude on west slope of Pichincha Volcano, Andean cloud forest, West slope, Tropical Andes, Ecuador

Loic Poidevin / Longbilled marsh wren (Cistothorus palustris) Quebec, Canada, May

Loic Poidevin / House wren (Troglodutes aedon) Pointe Pelee, Ontario, Canada, May

Loic Poidevin / Longbilled marsh wren (Cistothorus palustris) singing on bullrush, Quebec, Canada, May

Loic Poidevin / Longbilled marsh wren (Cistothorus palustris) profile portrait, Quebec, Canada, May

Ben Lascelles / Black-capped Donacobius (Donacobius atricapilla). Ibera Wetlands Provincial Park. Argentina, October

Ben Lascelles / Black-capped Donacobius (Donacobius atricapilla). Esteros del Ibera / Ibera Wetlands Provincial Park. Argentina, October

Andy Sands / Wren (Troglodytes troglodytes) singing from tree stump, Hertfordshire, England, UK, April

Fabrice Cahez / Wren (Troglodytes troglodytes) gathering moss for nest building, Allier, France, March

Claudio Contreras / Happy Wren (Thryothorus felix) with spider at the entrance of its nest, Maria Cleofas Island, Islas Marias Biosphere Reserve, Sea of Cortez (Gulf of California), Mexico, August.

David Tipling / 2020VISION / Wren (Troglodytes troglodytes) perched, singing, Cambridgeshire Fens, UK

David Tipling / 2020VISION / Wren (Troglodytes troglodytes) perched, singing, Cambridgeshire Fens, UK

Roland Seitre / Blue-and-white Fairywren (Malurus leucopterus leuconotus) male. Desert Park, Alice Springs, Northern Territory.

Roland Seitre / Turquoise Splendid Fairy-Wren (Malurus splendens callainus), female. Desert Park, Alice Springs, Northern Territory.

Roland Seitre / Turquoise Splendid Fairy-Wren (Malurus splendens callainus), male in bright plumage. Desert Park, Alice Springs, Northern Territory.

Brent Stephenson / South island wren (Xenicus gilviventris) male perched on a rock in its alpine habitat, Homer Tunnel, Fiordland National Park, New Zealand, January.

Andy Rouse / 2020VISION / Wren (Troglodytes troglodytes) singing with tail cocked from new pine growth. Wales, May.

Andy Rouse / 2020VISION / Wren (Troglodytes troglodytes) singing with tail cocked from new pine growth. Wales, May.

Andy Rouse / 2020VISION / Wren (Troglodytes troglodytes) singing with tail cocked from new pine growth. Wales, May.

Andy Rouse / 2020VISION / Wren (Troglodytes troglodytes) singing with tail cocked from new pine growth. Wales, May.

Andy Rouse / 2020VISION / Wren (Troglodytes troglodytes) singing with tail cocked from new pine growth. Wales, May.

Dave Watts / Superb Fairy wren (Malurus cyaneus) male Tasmania, Australia

Dave Watts / Superb Fairy wren (Malurus cyaneus) male Tasmania, Australia

Dave Watts / Superb Fairy wren (Malurus cyaneus) female singing, Tasmania, Australia

Dave Watts / Superb Fairy wren (Malurus cyaneus) female Tasmania, Australia

Dave Watts / Superb Fairy wren (Malurus cyaneus) female Tasmania, Australia

Fabrice Cahez / Wren (Troglodytes troglodytes) standing on frozen lake, Champagne, France, Februray.

Fabrice Cahez / Wren (Troglodytes troglodytes) standing on frozen lake, Champagne, France, Februray.

Andy Sands / Wren (Troglodytes troglodytes) perched with beak full of insects to feed young. Hertfordshire, England, UK, July.

Luiz Claudio Marigo / Southern house wren (Troglodytes musculus) perched in Atlantic Rainforest, Serrinha do Alambari Environmental Protection Area, Rio de Janeiro State, Southeastern Brazil.

Markus Varesvuo / Wren (Troglodytes troglodytes) singing portrait, Helsinki Finland June

Loic Poidevin / Eurasian Wren (Troglodytes troglodytes) perched. The Vendeen Marsh, French Atlantic Coast, January.

Tim Laman / Smoky Robin (Peneothello cryptoleucus) perched. Foja Mountains, Papua, Indonesia, 2007.

Patricio Robles Gil / Black-capped Donacobius (Donacobius atricapilla). Classification is unclear for this species, but it is thought to be related to the Trogons, Wrens or Thrushes. Parana, Southern Brazil.

Rolf Nussbaumer / Cactus Wren (Campylorhynchus brunneicapillus), adult perched on Cane Cholla (Opuntia imbricata). Laredo, Webb County, South Texas, USA, April.

Rolf Nussbaumer / Cactus Wren (Campylorhynchus brunneicapillus), adult singing on Cane Cholla (Opuntia imbricata). Laredo, Webb County, South Texas, USA, April.

Rolf Nussbaumer / Cactus Wren (Campylorhynchus brunneicapillus), adult singing on Cane Cholla (Opuntia imbricata). Laredo, Webb County, South Texas, USA, April.

Luiz Claudio Marigo / Bicolored Wren (Campylorhynchus griseus) in the Tropical Rainforest of Sierra Nevada de Santa Marta Natural National Park, near Minca village, Northern Colombia.

Marie Read / Superb Fairy-Wren (Malurus cyaneus) male in breeding plumage, Bunya Mountains National Park, Queensland, Australia, November.

Andy Sands / Wren (Troglodytes troglodytes) singing in spring. Hertfordshire, England, UK, April.

Rod Williams / Splendid Fairy-wren (Malurus splendens) male and female pair perched, Captive occurs South western Australia.

Brent Stephenson / Rifleman (Acanthisitta chloris) male collecting food for its nestlings. Boundary Stream Mainland Island, Hawkes Bay, New Zealand, January.

Markus Varesvuo / Wren (Troglodytes troglodytes) perched on branch, Finland, October

Markus Varesvuo / Wren (Troglodytes troglodytes) perched on branch, Finland, October

Markus Varesvuo / Wren (Troglodytes troglodytes) perched on branch, Finland, October

Colin Varndell / Wren (Troglodytes troglodytes) foraging in stream, in winter, Dorset, UK, December

David Tipling / Wren (Troglodytes troglodytes) in song at dawn. Norfolk, UK, April

Kim Taylor / Common Wren (Troglodytes troglodytes) portrait of fledgling / juvenile.

Kim Taylor / Common Wren (Troglodytes troglodytes) portrait of fledgling / juvenile.

Kim Taylor / Common Wren (Troglodytes troglodytes) portrait of fledgling / juvenile.

Kim Taylor / Common Wren (Troglodytes troglodytes) portrait of fledgling / juvenile.

Marie Read / House Wren (Troglodytes aedon) nest building, at its nest hole in an Aspen (Populus tremuloides) trunk, Mono Lake Basin, California, USA

Claudio Contreras / Guadalupe rock wren (Salpinctes obsoletus guadalupensis) perched on log, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, February

Claudio Contreras / Guadalupe rock wren (Salpinctes obsoletus guadalupensis) male singing, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, April

Andy Sands / Wren (Troglodytes troglodytes) singing from fence post, Hertfordshire, UK, April

David Kjaer / Wren (Troglodytes troglodytes) perched in Hawthorn, Wiltshire, England, UK, May.

Gerrit Vyn / Sedge Wren (Cistothorus platensis) camouflaged and perched on dry foliage, Alberta, Canada. May.

Gerrit Vyn / Rock Wren (Salpinctes obsoletus) portrait, standing on rock, Douglas County, Oregon, USA, April.

Gerrit Vyn / Marsh Wren (Cistothorus palustris) singing. Snohomish County, Washington, USA, April.

Gerrit Vyn / Marsh Wren (Cistothorus palustris) singing. Snohomish County, Washington, USA, April.

Gerrit Vyn / Marsh Wren (Cistothorus palustris) displaying. Snohomish County, Washington, USA, April.

Gerrit Vyn / House Wren (Troglodytes aedon) perched on a branch, Yakima County, Washington, USA, May.

Shattil & Rozinski / House wren (Troglodytes aedon) with insect prey in beak, nesting in old lodge, Wyoming, USA, North America

Rolf Nussbaumer / Cactus Wren (Campylorhynchus brunneicapillus) calling on Guayacan (Guaiacum angustifolium) Chisos Basin, Chisos Mountains, Big Bend National Park, Chihuahuan Desert, West Texas, USA

Rolf Nussbaumer / Bewick's Wren (Thryomanes bewickii) adult perched on branch, New Braunfels, San Antonio, Hill Country, Central Texas, USA

Pete Oxford / Grass / Short-billed Marsh Wren (Cistothorus platensis falklandicus) Singing in long grass. This species in endemic, and is the smallest of the resident birds. Sea Lion Island. South of mainland east...

Pete Oxford / Grass / Short-billed Marsh Wren (Cistothorus platensis falklandicus) Singing in long grass. This species in endemic, and is the smallest of the resident birds. Sea Lion Island. South of mainland east...

Pete Oxford / Cobb's / Rock wren (Troglodytes cobbi) Sea Lion Island. South of mainland east Falkland Island. Falkland Islands (Endemic to the Falkland Islands)

Mike Potts / White winged fairy wren (Malurus leucopterus) male, Cape Range NP, Exmouth, Western Australia, November

Stephen Dalton / Wren (Troglodytes troglodytes) flying with insect prey to nest in hanging basket, UK

Stephen Dalton / Wren ( Troglodytes troglodytes) in flight carrying insect prey, and approaching nest. Spring, England, UK