Rachel
There is an article about this in Spanish at the Diario de Jaen.. https://www.diariojaen.es/provincia/aumentan-a-16-los-huevos-de-quebrantahuesos-en-el-centro-de-cria-guadalentin-BY8247223
Also Clive’s article about the Sierra de Cazorla (where the breeding centre is) is worth a read. https://wildsideholidays.co.uk/sierra-cazorla-segura-y-las-villas/