Constantinos Petrinos / Great white shark (Carcharodon carcharias) in threat posture with stiff arched posture, Guadalupe Island or Isla Guadalupe, Pacific Ocean, Mexico, September. Vulnerable.

Mark Taylor / Black and white kitten and tabby and white kitten playing.

Theo Allofs / Large arched iceberg, Svalbard, Norway

Alex Hyde / Black Arches moth (Lymantria monacha) male, Surrey, UK. August.

Alex Hyde / Male Black Arches (Lymantria monacha) male showing feathery antennae. Photographed in mobile field studio on a white background. Surrey, UK. August.

Alex Hyde / Black Arches (Lymantria monacha) male photographed in mobile field studio on a white background. Surrey, UK. August.

Alex Hyde / Five-arched bridge over the River Wye at Bakewell, constructed in the 13th century. Bakewell, Peak District National Park, UK, May 2013.

Peter Cairns / Black Guillemot (Cepphus grylle) stretching wings on rock, Flatey Island, Iceland, June.

Ernie Janes / Clematis (Clematis montana) in flower growing over archway in walled garden, Norfolk, England, UK, June.

Fergus Gill / Guillemot (Uria aalge) stretching its wings. Fowlsheugh, Scotland, June.

Fergus Gill / Razorbill (Alca torda) stretching its wings. Fowlsheugh, Scotland, June.

Fergus Gill / Bridled Guillemot (Uria aalge) calling whilst stretching its wings. Fowlsheugh, Scotland, June.