Species Notes for this Location: Rattus norvegicus is commonly known as Norway/ brown rat. Brown rats most probably arrived on vessels. They are present on all three islands, Grand Cayman, Little Cayman and Cayman Brac especially in populated areas (Burton, 2003 in Varnham, 2006).
Management Notes for this Location: Environmental Health Section of the Government maintains a rodent control program (Morgan, 1994 in Varnham, 2006) in populated areas only. The Blue Iguana Recovery Programme carries out additional control to protect hatchling iguanas in the QE II Botanc Park on Grand Cayman (Burton, 2003 in Varnham, 2006). Long-term supression (or eradication) in areas supporting re-established populations of 'Critically Endangered (CR)' endemic Cayman island ground iguana (see Cyclura lewisi in IUCN Red List of Threatened Species) is ongoing (Burton, 2003 in Varnham, 2006).
Impacts: Habitat alteration: Rattus norvegicus is also likely to be having impacts on regeneration of native flora due to seed consumption (Burton, 2003 in Varnham, 2006). Reduction in native biodiversity: Rattus norvegicus is a predator on native snakes and lizards, including hatchling rock iguanas, and nesting birds (Burton, 2003 in Varnham, 2006).