Guy Edwardes / Pilsdon Pen and Marshwood Vale in morning mist, Quarr Hill, Dorset, England, UK. May 2014.

Juergen Freund / Man moving Grouper fish between fish pens, Tampakan, Kudat, Sabah, Borneo. June 2009. Second Place in the Portfolio Award of the Terre Sauvage Nature Images Awards Competition 2015.

Bruno D'Amicis / Fennec fox (Vulpes zerda) wild caught adult, kept in sheep pen in village, Kebili Governorate. Tunisia, April. Winner of the Fritz Polking Portfolio Award of the GDT Competition 2015.

Tui De Roy / Takahe (Porphyrio hochstetteri) family in large breeding pen, Burwood Breeding Center, New Zealand

Brent Stephenson / Stone cleats and circular dry-stone walls above the main settlement in Village Bay, Hirta. St Kilda, Outer Hebrides, Scotland. June.

David Tipling / Satin Bowerbird (Ptilonorhynchus violaceus) male depositing blue pen at bower, Lamington NP, Queensland, Australia, September

Cheryl-Samantha Owen / Cape gannet (Morus capensis) drying in a heated pen (a heat lamp illuminates the pen with a red light) after its first wash, which removed some of the oil that coated its feathers. Some oil remains on...

Gary K. Smith / Domestic sheep (Ovis aries) being moved from pen at livestock market after auction, Hawes Mart, Yorkshire, UK, September 2011

Lisa Hoffner / A baby orphan Elephant (Loxodonta africana), named Murka, wounded by a poacher's spear is comforted by the touch of another elephant's trunk from outside its pen. David Sheldrick Wildlife Trust Eleph...

Tim Laman / Grouper holding pens, destined for the live fish trade to Hong Kong. Raja Ampat Islands, West Papua, Indonesia, May 2007

Georgette Douwma / Loki whip goby (Bryaninopss loki) on Sea pen (Virgularia gustaviana). Komodo National Park, Indonesia

Georgette Douwma / Sea pen (Virgularia gustaviana) with a small porcelain crab on sandy sea bed, purple form. Rinca, Indonesia.