Np. Moore et al., THE PEREGRINE FALCO-PEREGRINUS IN QUARRIES - CURRENT STATUS AND FACTORS INFLUENCING OCCUPANCY IN THE REPUBLIC-OF-IRELAND, Bird study, 44, 1997, pp. 176-181
A survey of quarry-nesting Peregrines conducted in the Republic of Ire
land between 1991 and 1993 estimated that 65 quarries were occupied by
Peregrines. There was a marked east/west gradient in occupancy with m
ost occupied quarries in the east. Occupation of quarries by Peregrine
s is primarily influenced by cliff height.