Bence Mate / Red-legged honeycreeper (Cyanerpes cyaneus) two males on barbed wire. Costa Rica.

Gabriel Rojo / Saffron finch (Sicalis flaveola) on barbed wire, La Pampa, Argentina

Terry Whittaker / Arctic terns (Sterna paradisaea) with house in background, Flatey Island, Breioafjorour, Iceland. July

Andres M. Dominguez / Corn bunting (Emberiza calandra) singing, Prado del rey, Cadiz, Spain, March.

Shattil & Rozinski / Dead Great horned owl (Bubo virginianus) caught on a barbed wire fence, Colorado, USA, September.

Robin Chittenden / Red-breasted Blackbird (Sturnella militaris) singing on barbed wire in the rain, Trinidad, Trinidad and Tobago, April

Nick Upton / Jackdaw (Corvus monedula) standing on a clifftop fence post with the sea in the background, Polzeath, Cornwall, UK, April.

Nick Upton / Jackdaw (Corvus monedula) standing on a clifftop fence post with the sea in the background, Polzeath, Cornwall, UK, April.

Cyril Ruoso / Long-tailed Macaque (Macaca fascicularis) mother grooming her young among barbed wire, Thailand

Cyril Ruoso / Long-tailed Macaque (Macaca fascicularis) mother with two young walking among barbed wire, Thailand

Andy Trowbridge / Yellow-eyed Penguin (Megadyptes antipodes) standing by a barbed wire stock fence. Katiki Point, Moeraki, Otago, South Island, New Zealand. January.

Onne van der Wal / Barbed wire, South Africa, 2009.

David Kjaer / Corn Buntings (Miliaria calandra) and a female Yellowhammer (Emberiza citrinella) on barbed wire in spring, Wiltshire, England

Flip de Nooyer / Barn Swallow (Hirundo rustica) adult flying feeding chicks perched on barbed wire, Europe

Flip de Nooyer / Barn Swallow (Hirundo rustica) adult flying feeding three chicks perched on barbed wire, Europe