Mark Hamblin / 2020VISION / Rowan tree silhouetted above Loch Lurgainn with Cul Mor (left) and Ben More Coigach beyond, Coigach, Highland, Scotland, UK, November. Photographer quote: "Let's face it walking uphill is a drag – I g...

Philippe Clement / Horse drawn wagon at drag hunting demonstration in autumn, Belgium October 2011

Philippe Clement / Hunters on horseback with pack of hounds during drag hunting in autumn, an alternative to fox hunting, Europe October 2011

Philippe Clement / Hunter on horseback with pack of hounds during drag hunting in autumn, an alternative to fox hunting, Europe October 2011

Philippe Clement / Hunter on horseback with pack of hounds during drag hunting in autumn, an alternative to fox hunting, Europe October 2011

Jeff Rotman / Atlantic wolffish (Anarhichas lupus), Monkfish (Lophius americanus) and Cod fish (Gadus morhua) on deck of drag net fishing boat. Stellwagon Bank, New England, USA, Atlantic Ocean.

Kristel Richard / In drag hunting, the hounds follow a scent laid by a huntsman - at the opening meet of the Quorn Hunt, in Leicestershire, England, UK. October 2009

Kristel Richard / In drag hunting, a scent is laid over the ground for the hounds to follow, at the opening meet of the Quorn Hunt, in Leicestershire, England, UK. October 2009

Stephen Dalton / Purse web spider (Atypidae) using its fangs to drag woodlouse prey into its purse web, UK, Atypidae

Stephen Dalton / Purse web spider (Atypus affinis) using its fangs to drag fly prey into its purse web, UK, Atypidae

Nick Upton / High powered tractor competing in a "tractor pull" competition to drag a weighted sledge as far as possible, North Somerset show, Wraxall, Nr Bristol, UK. May 2009

Jeff Rotman / Fishermen drag rowing boat up the beach on return from a day of line fishing, Tofo, Mozambique, November 2008