Again I have begun the routes of program SACRE - Breeding Bird Survey .
Cliffs of limestone, breed Crag Martin, Vultures, Chough....
In this first transect route (25 point counts, 5 minutes each on 10-km square ) by the square VN 4040, I have detected several species of African migratory birds just arrivals, Golden oriole (Oriolus oriolus) , Bonelli´s Warbler (Phylloscopus bonelli), Hoopoe (Upupa epops), Common Whitethroat (Sylvia communis), Northern Wheatear (Oenanthe oenanthe), Common Redstart (Phoenicurus phoenicurus), Booted eagle (Hieraaetus pennatus)**, thus like other already views days before.
Different habitats are crossed within the square, the first part of it, with the river Ebro, the riversides and the cliffs.
** out of transect 
GR 99 River Ebro footpath
In the second part, many points counts are located in the moor.
A total of 51 detected species, similar as other years.
New species have not been detected.
Like curiosity, the Eurasian Crag Martin making the nests in the church of Ahedo de Butrón next to the House Martin, the Crag Martin is more normal to see him make the nests in caves and cavities on cliff faces.
Crag Martin left and House Martin right
European Bird Census Council
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