Trial bike rider kicking up sand at the sand dunes of Lancelin, Western Australia, Australia, Pacific

Mountain sheep herded by shepherd near Portizia de la Reina on Picos de Europa mountains, in Castilla y Leon, Northern Spain

American alligator with mouth open showing its teeth basking by Turner River by Tamiami Trial, the Florida Everglades, USA

Trial Island lighthouse, Vancouver Island, British Columbia, Canada, North America

List of important historical trials held in the Guildhall, Guildhall, City of London, London, England, United Kingdom, Europe

Trial biker on metal sculpture, Linz

Trial biker on steel rope at Danube River, Linz

Students of the Escuela Ceiba school staging an election campaign, panel discussion, as part of their social studies class prior to the upcoming parliamentary elections, Lomas de Santa Faz slum, Guatemala City, Guatemala, Central America

RFID, Radio-frequency identification, clothing tags, Galeria Kaufhof department store, Essen, North Rhine-Westphalia, Germany

Stuntman Mike Auffenberg driving a trial motorcycle without a front wheel, Koblenz, Rhineland-Palatinate, Germany, Europe

RFID, Radio-frequency identification, clothing tags, Galeria Kaufhof department store, Essen, North Rhine-Westphalia, Germany

RFID, Radio-frequency identification, clothing tags, Galeria Kaufhof department store, Essen, North Rhine-Westphalia, Germany

RFID, Radio-frequency identification, clothing tags, Galeria Kaufhof department store, Essen, North Rhine-Westphalia, Germany

Reflection in Shadow Lake, Trial at the Sunrise Visitor Center, Mount Rainier National Park, Washington, USA, North America

Trial motor-cycling

Small distillation unit for trial purposes, Aalborg Akvavit spirits factory, Aalborg, North Jutland, Denmark, Europe

Experienced riders descend a downhill mountain bike trial which drops into the town of Moab, Utah.

Experienced riders descend a downhill mountain bike trial which drops into the town of Moab, Utah.

Rear view of man biking on trial, Colorado, USA