Common starlings introduced to areas such as Australia or North America , where other members of the genus are absent , may affect native species through competition for nest holes . In North America , chickadees , nuthatches , woodpeckers , purple martins and other swallows may be affected . In Australia , competitors for nesting sites include the crimson and eastern rosellas . For its role in the decline of local native species and the damages to agriculture , the common starling have been included in the IUCN List of the world 's 100 worst invasive species .