30In that regard, the Court has held that the IBA 98 directory, which provides an up-to-date list of the areas of importance for the conservation of birds in Spain, constitutes, in the absence of scientific proof to the contrary, a basis of reference permitting an assessment to be made as to whether that Member State has classified areas of a sufficient number and size as SPAs to protect all the bird species listed in Annex I to the Birds Directive and the migratory species not listed in that annex (see Case C-235/04 Commission v Spain [2007] ECR I-5415, paragraph 27).
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