Kristel Richard / A member of Marbach's Quadrille team in traditional uniform, mounted on a Wurttemberg horse, performing during the stud's 500th anniversary celebrations. Marbach National Stud, Swabian Alps, near Reut...

Kristel Richard / Marbach riders in traditional uniform, riding Wurttemberg stallions during the stud's 500th anniversary celebrations. Marbach National Stud, Swabian Alps, near Reutlingen, in Baden-Wurttemberg, German...

Kristel Richard / A Marbach rider in traditional uniform, mounted on a Wurttemberg stallion, performing during the stud's 500th anniversary celebrations. Marbach National Stud, Swabian Alps, near Reutlingen, in Baden-W...

Kristel Richard / Marbach's Quadrille in traditional uniform, mounted on Wurttemberg horses, performing during the stud's 500th anniversary celebrations. Marbach National Stud, Swabian Alps, near Reutlingen, in Baden-W...

Kristel Richard / Marbach's Quadrille in traditional uniform, mounted on Wurttemberg horses, performing during the stud's 500th anniversary celebrations. Marbach National Stud, Swabian Alps, near Reutlingen, in Baden-W...

Kristel Richard / A member of Marbach's Quadrille team in traditional uniform, mounted on a Wurttemberg horse during the stud's 500th anniversary celebrations. Marbach National Stud, Swabian Alps, near Reutlingen, in B...

Kristel Richard / Members of Marbach's Quadrille team in traditional uniform, mounted on Wurttemberg horses during the stud's 500th anniversary celebrations. Marbach National Stud, Swabian Alps, near Reutlingen, in Bad...

Kristel Richard / A Marbach rider in traditional uniform riding a Wurttemberg stallion during the stud's 500th anniversary celebrations. Marbach National Stud, Swabian Alps, near Reutlingen, in Baden-Wurttemberg, Germa...

Kristel Richard / A member of Marbach staff in traditional uniform driving a Black Forest stallion during the stud's 500th anniversary celebrations. Marbach National Stud, Swabian Alps, near Reutlingen, in Baden-Wurtte...

Matthew Maran / Common tern (Sterna hirundo) in flight, Hampstead Heath, London, UK, July.

Ernie Janes / Mute swan (Cygnus olor) on water, England, December.

Mike Potts / Campbell albatross (Thalassarche impavida) in flight over sea, south of Campbell Island, New Zealand.