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

Ingo Arndt / Cactus Wren (Campylorhynchus brunneicapillus) perched on Saguaro cactus (Carnegiea gigantea), Saguaro National Park, Arizona, USA.

Rolf Nussbaumer / Bewick's wren (Thryomanes bewickii), adult perched on icy branch of Possum Haw Holly (Ilex decidua) with berries, Hill Country, Texas, USA. February

Markus Varesvuo / Wren (trogldytes troglodytes) foraging over water in winter, Espoo, Finland

Markus Varesvuo / Wren (trogldytes troglodytes) foraging in snow and ice, Espoo, Finland

Markus Varesvuo / Wren (trogldytes troglodytes) foraging near water, in snow, Espoo, Finland

Markus Varesvuo / Wren (trogldytes troglodytes) foraging in winter, on frosty ground, Espoo, Finland