Carl
Here is a PDF of a very concise article that pretty much says that white tailed eagles were never in the Iberian Peninsular as a breeding species…. Thus the project is a rewilding one and not a re introduction…
However, I kind of agree with Dave in that if this eagle had not been persecuted, poisoned and destroyed across the entirety of its range then undoubtedly it would have occupied suitable habitat at some point in the Iberian peninsular expanding its range as all species do…..