a Spanish historian like Portillo, wrote of the monkeys:

Repeated introduction of animals and the lack of reliable data concerning founders of the Gibraltar macaque population has obscured their origin. The fact that all extant Gibraltarian mtDNA haplotypes were also found in North Africa, combined with the lack of fossil evidence of M. sylvanus in Gibraltar at the end of the last glaciation, greatly diminishes the possibility that the Gibraltar macaques represent or include any remnant of the original European population, a possibility