Steve Downer / Close up of a Canada goose gosling (Branta canadensis) sleeping, with other goslings in the background, Birmingham, England, UK, June.

Pete Oxford / Domestic Cattle (Bos taurus) being herded by Chagra cowboys at a hacienda during the annual overnight cattle round-up, Andes Mountains, Ecuador

Pete Oxford / Domestic Cattle (Bos taurus) being herded by Chagra cowboys at a hacienda during the annual overnight cattle round-up, Andes Mountains, Ecuador

Pete Oxford / Domestic Cattle (Bos taurus) calf roped by Chagra cowboys at a hacienda during the annual overnight cattle round-up, Andes Mountains, Ecuador

Pete Oxford / Domestic Cattle (Bos taurus) being herded by Chagra cowboys at a hacienda during the annual overnight cattle round-up, Andes Mountains, Ecuador

Pete Oxford / Domestic Cattle (Bos taurus) being herded by Chagra cowboys at a hacienda during the annual overnight cattle round-up, Andes Mountains, Ecuador

Pete Oxford / Domestic Cattle (Bos taurus) being herded by Chagra cowboys at a hacienda during the annual overnight cattle round-up, Andes Mountains, Ecuador

Pete Oxford / Domestic Cattle (Bos taurus) being herded by Chagra cowboys at a hacienda during the annual overnight cattle round-up, Andes Mountains, Ecuador

Pete Oxford / Chagra cowboy with a bull he has roped on an overnight ride at a hacienda during the annual cattle round-up, Andes Mountains, Ecuador

Pete Oxford / Chagra cowboys, herding cattle during annual round-up, Yanahurco Hacienda, Andes, Ecuador

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) group running, Bureau of Land Management wranglers round up surplus horses for adoption, Wyoming

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) chased by Bureau of Land Management wranglers who round up surplus horses for adoption, Wyoming

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) chased by Bureau of Land Management wranglers who round up surplus horses for adoption, Wyoming

Pete Oxford / Domestic Cattle (Bos taurus) being herded by Chagra cowboys at a hacienda during the annual overnight cattle round-up, Andes Mountains, Ecuador

Pete Oxford / Chagra cowboy roping a bull at a hacienda during the annual round-up, Andes Mountains, Ecuador

Pete Oxford / Chagra cowboy sorting cattle at a hacienda during the annual round-up, one chagra is charged by a bull while his friends watch, Andes Mountains, Ecuador

Ross Couper-Johnston / Guachos rounding up cattle, Ibera marshes NR, Argentina

Ingo Arndt / Domestic Sheep (Ovis aries) flock being rounded up by cowboy, Patagonia, Chile

Colin Monteath / Caribou (Rangifer tarandus) herd gathering in valley after spending winter in Hunkher Mountains during spring round up, Mongolia

Colin Monteath / Caribou (Rangifer tarandus) herd gathering in valley after spending winter in Hunkher Mountains during spring round up, Mongolia

Colin Monteath / Caribou (Rangifer tarandus) herd being moved down valley by Tsataan herder after spending winter in Hunkher Mountains during spring round up, Mongolia

Colin Monteath / Caribou (Rangifer tarandus) herd being moved down valley by Tsataan herder after spending winter in Hunkher Mountains during spring round up, Mongolia

Onne van der Wal / Locals rounding the mark in traditional boats during Grenada Sailing Festival 2005, Grenada, Caribbean.

Onne van der Wal / Locals rounding the mark in traditional boats during Grenada Sailing Festival 2005, Grenada, Caribbean.

Onne van der Wal / Racing yachts rounding the mark at Grenada Sailing Festival 2005, Grenada, Caribbean.

Onne van der Wal / Locals rounding the mark in traditional boats during Grenada Sailing Festival 2005, Grenada, Caribbean.

Onne van der Wal / The crew works together at a mark rounding during the 12 Metre World's Competition 2005, Newport, Rhode Island, USA.

Onne van der Wal / "Intrepid", "Courageous" and other yachts rounding the mark during the 12 Metre World's Competition 2005, Newport, Rhode Island, USA.

Onne van der Wal / "Weatherly" rounding the mark at the 12 Metre World Competition 2006, Newport, Rhode Island, USA.

Onne van der Wal / Locals rounding the mark in traditional boats during Grenada Sailing Festival 2005, Grenada, Caribbean.

Barry Bland / Ben Ainslie competing in the fourth round of the Men's Single Handed Dinghy Finn, Olympic Games, Athens, Greece, 15 August 2004. Editorial Use Only.

Onne van der Wal / Rounding the mark during the 2006 12 Metre North American Championships, Newport, Rhode Island, USA.

Onne van der Wal / Split-level view of colourful local boat rounding the mark during a race at Grenada Sailing Festival, Caribbean, 2006.

Onne van der Wal / Rounding the mark at the Sunfish World Championship, Charleston, South Carolina, USA.

Barry Bland / Great Britain's Nick Dempsey competing in the fourth round of the Men's Windsurf Mistral, Olympic Games, Athens, Greece, 15 August 2004. Editorial Use Only.

Onne van der Wal / Yacht rounding the mark during the 2006 12 Metre North American Championships, Newport, Rhode Island, USA.

Onne van der Wal / Dinghy capsizing while rounding the mark during the Optimist regatta, Newport, Rhode Island, USA.

Barry Bland / Women's Windsurf Mistral race during the Olympic Games, Athens, Greece 15 August 2004. Editorial Use Only.

Barry Bland / Ben Ainslie, Men's Single Handed Dinghy Finn, Olympic Games, Athens, Greece, 15 August 2004. Editorial Use Only.

Onne van der Wal / Three 12m yachts rounding the weather mark during a corporate charter on a foggy day in front of Newport Bridge, Rhode Island, USA.

Onne van der Wal / The fleet rounding the Needles, during the America's Cup Jubilee in 2001, Isle of Wight, UK.

Rick Tomlinson / Class 7 "Mist" a Nicholson 33 skippered by Ross Elliston rounds NE Gurnard buoy during Skandia Cowes Week, Solent, UK, day 6, August 3, 2006.

Rick Tomlinson / Darings round the leeward mark at South Ryde Middle in breezy conditions during Skandia Cowes Week, UK day 4 August 1, 2006.

Rick Tomlinson / Volvo Open 70 "ABN AMRO ONE" rounds East Shingles Buoy during Skandia Cowes Week, UK, day 4, August 1, 2006.

Rick Tomlinson / Foredeck crew aboard J-Class yacht "Velsheda" lower the jib after the windward mark rounding, Antigua Classic Yacht Regatta, April 2003.

Rick Tomlinson / Yachts lower their spinnakers in time for the leeward mark rounding.

Rick Tomlinson / Two Ker 11.3's on day 4 at Skandia Cowes week round the leeward mark in a strong current, Tuesday August 5th, 2003.

Rick Tomlinson / Overall race winner "ABN AMRO One" (NZ) rounds the weather mark during the inport race in Melbourne Australia during the Volvo Ocean Race, 2005-2006.

Rick Tomlinson / Darings round East Ryde Middle during Skandia Cowes Week, UK, day 4 August 1, 2006.

Rick Tomlinson / Crew gather in the massive spinnaker after rounding the leeward mark aboard "Morning Glory" during Antigua Race Week, 2004.

Rick Tomlinson / Bowman prepares the spinnaker pole for the windward mark rounding in the Mumm 30 fleet, Key West, 1997.

Rick Tomlinson / Bowman of Farr 40 "Atalanti XI" prepares the spinnaker pole for the windward mark rounding, Key West Race Week, 2000.

Rick Tomlinson / Farr 60 Rima races at Key West Race Week, 2000.

Rick Tomlinson / Spinnaker hoist after the windward mark rounding aboard the Swan 60 "Spirit of Jethou", Cork Week 2000.

Rick Tomlinson / Bowman prepares the spinnaker pole for the windward mark rounding in the Mumm 30 fleet, Key West, 1997.

Rick Tomlinson / Crew on ID35 "Smiling Bulldog" prepare to hoist the spinnaker at the windward mark during Key West Race Week, 2000.

Rick Tomlinson / Crew aboard "The Card" celebrate rounding Cape Horn at the end of their Southern Ocean run, Whitbread Round the World Race, 1989-90.

Rick Tomlinson / Fleet rounds the windward mark at the Farr 40 Europeans, held on the Solent, UK, 2001.

Rick Tomlinson / Spinnakers are on the bow ready for the windward mark rounding during the Commodore's Cup, 1996.

Rick Tomlinson / Crew of the Sigma 38 "Red Coat III" pull in the spinnaker after the leeward mark rounding.

Rick Tomlinson / Crew of Farr 40 "Solution" hoist the spinnaker at the windward mark rounding.

Rick Tomlinson / Fifty footers rounding the windward mark at a Miami regatta.

Rick Tomlinson / Crew aboard "Juno" prepare the spinnaker pole for the windward mark rounding, Key West Race Week, 1991.

Rick Tomlinson / Fifty footers rounding the windward mark at Newport, 1990.

Rick Tomlinson / Spinnaker poles are prepared for a windward mark rounding, Admiral's Cup, 1995.

Rick Tomlinson / "America True" team train for their America's Cup campaign in the ID48 at Key West Race Week, USA.

Rick Tomlinson / Two crewmen aboard "Abracadabra" lower the jib on the submerged bow after rounding the mark and hoisting the spinnaker during racing.

Rick Tomlinson / Merit Cup catches a wave as she rounds the windward mark at the SORC, 1999.

Onne van der Wal / Preparing the spinnaker for rounding the windward mark aboard a race yacht.

Onne van der Wal / Aerial view of race yachts rounding the windward mark.

Onne van der Wal / Spinnaker drop while rounding the leeward mark at the Kenwood Cup.

Onne van der Wal / The fleet rounding the Needles, during the America's Cup Jubilee in 2001, Isle of Wight, UK.

Onne van der Wal / Crew of "Cerida" sitting on the windward rail rounding the windward mark during the America's Cup Jubilee held in Cowes, Isle of Wight, England 2001.

Onne van der Wal / Crew aboard 12 metre "Onawa" preparing the spinnaker pole for the windward mark rounding at the America's Cup Jubilee, Isle of Wight, England 2001.

Onne van der Wal / Rounding the mark while racing during the Hobie 16 Nationals, Narragansett, Rhode Island, USA. September 2006.

Rick Tomlinson / Farr 40 "Appreciation Conspiracy" hoists the spinnaker after rounding the windward mark, Key West, 2000.

Onne van der Wal / Dinghy fleet rounding the mark during the Optimist regatta, Newport, Rhode Island, USA.

Rick Tomlinson / Fifty footers rounding the windward mark at Newport, 1990.

Onne van der Wal / Close rounding of the mark during Key West Race Week, Florida, USA.

Rick Tomlinson / Mark rounding in the ID35 fleet at Key West Race Week, 2000.

Rick Tomlinson / Bowman prepares the spinnaker pole for the windward mark rounding, Key West Race Week, 1997.

Mike Read / Commoners rounding up New Forest ponies during the annual round-up / drift, beside Amberwood Inclosure, New Forest National Park, Hampshire, UK, October 2010

Mike Read / New Forest ponies, commoner rounding up mare and foal during the annual round-up / drift, near Brockenhurst, New Forest National Park, Hampshire, England, September 2004

Donald M. Jones / American Bison (Bison bison) in paddock at annual roundup, National Bison Range, Montana

Pete Oxford / Domestic Cattle (Bos taurus) group round up to be used for pulling the ox carts during the floods, Brazil

Pete Oxford / Domestic Cattle (Bos taurus) group round up by cowboy to be used for pulling the ox carts during the floods, Brazil

Pete Oxford / Domestic Cattle (Bos taurus) being herded by Chagra cowboys at a hacienda during the annual overnight cattle round-up, Andes Mountains, Ecuador

Pete Oxford / Ocelot (Leopardus pardalis) fur and goat hair on chaps worn by Chagra cowboys at a hacienda during the annual overnight cattle round-up, Andes Mountains, Ecuador

Pete Oxford / Domestic Cattle (Bos taurus) being herded by Chagra cowboys at a hacienda during the annual overnight cattle round-up, Andes Mountains, Ecuador

Pete Oxford / Domestic Cattle (Bos taurus) being herded by Chagra cowboys at a hacienda during the annual overnight cattle round-up, Andes Mountains, Ecuador

Pete Oxford / Domestic Cattle (Bos taurus) being herded by Chagra cowboys at a hacienda during the annual overnight cattle round-up, Andes Mountains, Ecuador

Pete Oxford / Domestic Cattle (Bos taurus) being caught and branded by Chagra cowboys at a hacienda during the annual overnight cattle round-up, Andes Mountains, Ecuador

Pete Oxford / Chagra cowboys lined up at a hacienda in the Andes Mountains for the annual overnight cattle round-up receiving orders from el patron, Ecuador

Tui De Roy / Vicuna (Vicugna vicugna) round-up, bearing the finest fiber, wild herds are corralled for shearing in ancient tradition, native community profits from highly valuable wool, Pampa Galeras National Rese...

Doug Gimesy / Kangaroo Island kangaroo (Macropus fuliginosus fuliginosus) jumping in front of car rounding bend, a near miss as car travelling relatively slowly, compared to recommended speed limit. Kangaroo Islan...