Striated Caracara or Johnny Rook Phalcoboenus australis on the Falkland Islands Marauding bachelor group of subadults and juveniles on a dead gentoo penguin The striated caracara is a strictly protected bird of prey living only on some islands like the. Striated Caracara or Johnny Rook Phalcoboenus australis on the Falkland Islands Marauding bachelor group of subadults and juveniles on a dead gentoo penguin The striated caracara is a strictly protected bird of prey living only on some island