Juan Carlos Munoz / Dolmen Cajiron II, a megalithic tomb. Valencia de Alcantara, Sierra de San Pedro, Extremadura, Spain. September.

Roger Powell / Pair of Lesser Kestrels (Falco naumanni) mating at the entrance to their nest, Alcantara, Extremadura, Spain.

Juan Carlos Munoz / Alcantara River Canyon with basalt lava columns, Mount Etna, Sicily, Italy

Juan Carlos Munoz / Alcantara River Canyon with basalt lava columns, and rocks covered in algae, Mount Etna, Sicily, Italy

Roger Powell / Coloured and marked variation of the Natterjack Toad (Bufo calamita). Iberia Alcantara, Extremadura, Spain, May.

Pete Oxford / Cork Oak (Quercus suber) bark just cut and taken from dryer, San Vicente de Alcantara, Extremadura, Spain

Pete Oxford / Cork Oak (Quercus suber) trunk showing where bark has recently been removed, San Vicente de Alcantara, Extremadura, Spain

Pete Oxford / Cork Oak (Quercus suber) showing where bark has recently been removed, San Vicente de Alcantara, Extremadura, Spain

Pete Oxford / Cork Oak (Quercus suber) showing where bark has recently been removed, San Vicente de Alcantara, Extremadura, Spain

Pete Oxford / Cork Oak (Quercus suber) showing where bark has recently been removed, San Vicente de Alcantara, Extremadura, Spain

Pete Oxford / Cork Oak (Quercus suber) bark at the factory to be stacked for processing the following year, San Vicente de Alcantara, Extremadura, Spain

Pete Oxford / Cork Oak (Quercus suber) bark being offloaded at the factory to be stacked for processing the following year, San Vicente de Alcantara, Extremadura, Spain

Pete Oxford / Cork Oak (Quercus suber) bark being stacked and loaded onto trucks for transporting to the factories, San Vicente de Alcantara, Extremadura, Spain

Pete Oxford / Cork Oak (Quercus suber) bark being harvested for wine corks and other products, San Vicente de Alcantara, Extremadura, Spain

Pete Oxford / Cork Oak (Quercus suber) bark being harvested for wine corks and other products, San Vicente de Alcantara, Extremadura, Spain

Pete Oxford / Cork Oak (Quercus suber) bark being harvested for wine corks and other products, San Vicente de Alcantara, Extremadura, Spain

Pete Oxford / Cork Oak (Quercus suber) bark being harvested for wine corks and other products, San Vicente de Alcantara, Extremadura, Spain

Pete Oxford / Cork Oak (Quercus suber) bark being harvested for wine corks and other products, San Vicente de Alcantara, Extremadura, Spain

Pete Oxford / Cork Oak (Quercus suber) bark stacked to straighten before going through steam room, San Vicente de Alcantara, Extremadura, Spain

Pete Oxford / Cork Oak (Quercus suber) bark being held by Manuel de Mato Ramilo, San Vicente de Alcantara, Extremadura, Spain

Roger Powell / House Martin {Delichon urbicum} at nest complex on side of building, Alcantara, Spain

Roger Powell / Lesser Kestrel {Falco naumanni} pair mating on Church parapet, Alcantara, Spain

Roger Powell / Head-on shot of Lesser Kestrel {Falco naumanni} flying in with a Migratory Locust in its beak as a courtship offering for its mate, Alcantara, Spain

Roger Powell / Feral Pigeon / Rock dove {Columba livia} display-flying at nest site, Alcantara, Spain

Roger Powell / Lesser Kestrel {Falco naumanni} male greeting female arriving at nest site in building, Alcantara, Spain

Roger Powell / Lesser Kestrel {Falco naumanni} female hovering in flight, Alcantara, Spain

Roger Powell / Lesser Kestrel {Falco naumanni} male diving in flight, Alcantara, Spain

Roger Powell / White Stork {Ciconia ciconia} in flight carrying nesting material, Alcantara, Spain

Roger Powell / Lesser Kestrel {Falco naumanni} male at nest site in church wall, looking out for returning female, Alcantara, Spain

Roger Powell / Social gathering of Spotless Starlings {Sturnus unicolor} on rooftop television aerial, Alcantara, Spain

Roger Powell / Lesser Kestrel {Falco naumanni} male at nest site in church wall, looking out for returning female, Alcantara, Spain

Roger Powell / Roman bridge, built by emperor Trajan, over river Tejo, Alcantara, Extremadura, Spain

Roger Powell / Ancient Dolmen (megalithic tomb) in Extremadura, San Vicente de Alcantara, Extremadura, Spain

Roger Powell / Roman bridge, built by emperor Trajan, over river Tejo, Alcantara, Extremadura, Spain

Roger Powell / Ancient Dolmen in old Olive grove, San Vicente de Alcantara, Extremadura, Spain

Roger Powell / Male European serin (Serinus serinus) perched on barbed wire. Alcantara, Extremadura, Spain. April.

Roger Powell / Male European serin (Serinus serinus) perched on barbed wire. Alcantara, Extremadura, Spain. April.

Roger Powell / Feral pigeon (Columba livia domestica) sitting at entrance to its nest hole in church wall. Alcantara, Extremadura, Spain. April.

Roger Powell / Lesser Kestrel (Falco naumanni) pair leaving nest, Alcantara church, Alcantara, Extremadura, Spain.

Roger Powell / Lesser kestrel (Falco naumanni) male leaving nest, with female watching, Alcantara church, Alcantara, Extremadura, Spain.

Roger Powell / Lesser kestrel (Falco naumanni) defending nest hole from encroaching female, Alcantara church, Alcantara, Extremadura, Spain.

Roger Powell / Lesser kestrel (Falco naumanni) males disputing ownership of a nest hole, Alcantara church, Alcantara, Extremadura, Spain.

Roger Powell / Lesser kestrel (Falco naumanni) males fighting over ownership of a nest hole, Alcantara church, Alcantara, Extremadura, Spain.

Roger Powell / Lesser kestrel (Falco naumanni) pair perched at nest hole entrance, Alcantara church, Alcantara, Extremadura, Spain.

Roger Powell / Lesser kestrel (Falco naumanni) pair perched at nest entrance, Alcantara church, Alcantara, Extremadura, Spain

Roger Powell / Lesser kestrel (Falco naumanni) Male calling whilst perched at nest hole entrance, Alcantara church, Alcantara, Extremadura, Spain.

Roger Powell / Lesser kestrel (Falco naumanni) female perched at nest entrance, Alcantara church, Alcantara, Extremadura, Spain.

Roger Powell / Lesser kestrel (Falco naumanni) male flying, Alcantara church, Alcantara, Extremadura, Spain.

Roger Powell / Lesser kestrel (Falco naumanni) male flying to nest site in Alcantara church wall, Alcantara, Extremadura, Spain.

Roger Powell / Lesser kestrel (Falco naumanni) male flying to nest site in Alcantara church wall, Alcantara, Extremadura, Spain.

Roger Powell / Lesser kestrel (Falco naumanni) male leaving nest site, Alcantara church, Alcantara, Extremadura, Spain.

Roger Powell / Lesser kestrel (Falco naumanni) male leaving nest, Alcantara church, Alcantara, Extremadura, Spain.

Roger Powell / Lesser kestrel (Falco naumanni) female flying, Alcantara church, Alcantara, Extremadura, Spain.

Roger Powell / Lesser kestrel (Falco naumanni) leaving nest, Alcantara church, Alcantara, Extremadura, Spain.

Roger Powell / Lesser kestrel (Falco naumanni) females fighting over ownership of a nest site in a church wall, Alcantara church, Alcantara, Extremadura, Spain.

Roger Powell / White stork (Ciconia ciconia) male landing and female engaging in pair bonding display beside nest on medieval dome tower, Alcantara, Extremadura, Spain.

Roger Powell / White stork (Ciconia ciconia) pair displaying near nest, medieval dome tower, Alcantara, Extremadura, Spain.

Roger Powell / White stork (Ciconia ciconia) pair displaying near nest, medieval dome tower, Alcantara, Extremadura, Spain.

Roger Powell / White stork (Ciconia ciconia) pair resting on nest, medieval dome tower, Alcantara, Extremadura, Spain.

Roger Powell / White stork (Ciconia ciconia) pair displaying on nest, medieval dome tower, Alcantara, Extremadura, Spain.

Roger Powell / White stork (Ciconia ciconia) male landing & female displaying whilst incubating on nest, medieval dome tower, Alcantara, Extremadura, Spain.

Roger Powell / White stork (Ciconia ciconia) pair mating next to nest, medieval dome tower, Alcantara, Extremadura, Spain.

Roger Powell / White stork (Ciconia ciconia) pair about to mate next to nest, medieval dome tower, Alcantara, Extremadura, Spain.

Roger Powell / White stork (Ciconia ciconia) pair about to mate, beside nest, medieval dome tower, Alcantara, Extremadura, Spain.

Roger Powell / White stork (Ciconia ciconia) pair about to mate, beside nest, medieval dome tower, Alcantara, Extremadura, Spain.

Roger Powell / White stork (Ciconia ciconia) pair about to mate on nest, medieval dome tower, Alcantara, Extremadura, Spain.

Roger Powell / White stork (Ciconia ciconia) pair about to mate on nest, medieval dome tower, Alcantara, Extremadura, Spain.