Host shifts are widespread among avian haemosporidians, although the success of transmission depends upon parasite?host and parasite?vector compatibility. Insular avifaunas are typically characterized by a low prevalence and diversity of haemosporidians, although the underlying ecological and evolutionary processes remain unclear. This study investigated the parasite transmission network in an insular system formed by Eleonora's falcons, louse flies that parasitize the falcons , and...