Mark Hamblin / 2020VISION / Two Goldfinches (Carduelis carduelis) squabbling over Common teasel (Dipsacus fullonum) seeds in winter, Hope Farm RSPB reserve, Cambridgeshire, England, UK, February. 2020VISION Exhibition.

Nick Upton / Common teasel (Dipsacus fullonum) close up of flowerhead, Wiltshire, UK, August.

Nick Upton / Common teasel (Dipsacus fullonum) seedheads covered with hoar frost, Wiltshire, UK, January.

Floris van Breugel / A field of Teasel, an invasive species, Eastern Oregon, USA, September

Kim Taylor / Goldfinch (Carduelis carduelis) perched on teazel seedhead (Dipsacus sp) in winter, Surrey, UK, December

David Tipling / 2020VISION / Silhouette of Teazel heads (Dipsacus fullonum) at dawn, Woodwalton Fen, Cambridgeshire, UK, December

Chris Gomersall / 2020VISION / Winter stubble and conservation margin around arable land with Teasels (Dipsacus fullonum) seedheads, RSPB's Hope Farm, Cambridgeshire, UK, February 2011.

Chris Gomersall / 2020VISION / Teasels (Dipsocus fullonum) in conservation margin on arable farmland in Hertfordshire. March 2011.

Chris Gomersall / 2020VISION / Landscape view of RSPB's Hope Farm reserve showing Oilseed rape (Brassica napus) crop with Common teasels (Dipsacus fullonum) growing in conservation margin in the foreground, Cambridgeshire, England,...

Chris O'Reilly / Teasel (Dipsacus fullonum) silhouette at dawn RSPB Snettisham, Norfolk, UK

Nigel Bean / Teasel (Dipsacus fullonum) seedhead covered in thick hoar frost, Somerset Levels, UK, December

Nigel Bean / Teasel (Dipsacus fullonum) seedhead covered in thick hoar frost, Somerset Levels, UK, December