In the world :

• IUCN -The World Conservation Union: VULNERABLE.
  http://www.iucn.org/, http://www.redlist.org/

• BirdLife International: VULNERABLE.
  http://www.birdlife.net/

In Europe:

• Directive 79/409/EEC on the Conservation of Wild Birds : SUBJECT OF SPECIAL CONSERVATION MEASURES.
  http://europa.eu.int/scadplus/leg/en/lvb/l28046.htm

• Directive 92/43/EEC on the conservation of natural habitats and of wild fauna and flora : HABITAT SUBJECT OF SPECIAL CONSERVATION MEASURES.
  http://europa.eu.int/scadplus/leg/en/lvb/l28076.htm

• . Appendix II of the Bonn Convention, about the conservation of migratory species of wild animals.
  http://europa.eu.int/scadplus/leg/en/lvb/l28051.htm

• Appendix II of the Bern convention, relative to the conservation of European wildlife and natural habitats: STRICTLY PROTECTED.
  http://europa.eu.int/scadplus/leg/en/lvb/l28050.htm

In Spain:

• National List of Threatened Species, Royal Decree 439/90 : OF SPECIAL INTEREST.
  http://www.nekanet.net/Naturaleza/caza/caza/pdf/cz25f.pdf

• Red Book of the Vertebrate of Spain : VULNERABLE
  (in press)