Norway rat

Kauaʻi evidence

Kauaʻi plans establish Rattus presence; island-wide species-level distribution requires additional exact local records.

Names and classification

Scientific name

Rattus norvegicus

Common names

Norway rat

Record type

species

Kauaʻi occurrence and status

Kauaʻi occurrence

Confirmed on Kauaʻi; local distribution needs review

Origin

Introduced

Conservation status

Not listed

Evidence date

2026-09-13

Evidence limits

Do not upgrade this record to confirmed local occurrence without an exact Kauaʻi source locator.

Habitat and ecology

Habitats

settlements · ports · wetlands · farms

Food and resource needs

omnivorous foods · eggs · small fauna

Reproduction

burrows · structures

Shelter

ground cover · drainage · buildings

Threats and conservation

Threats

predation · disease · food competition

Conservation actions

sanitation · trapping · port biosecurity

Monitoring

trap indices · port surveillance

Data gaps

Exact Kauaʻi locators and encounter records require strengthening.

Process and seasonal context

Seasonal timing

Established

Seasonal description

Kauaʻi status: Confirmed on Kauaʻi; local distribution needs review. Ecological relationships include wetlands, ports, nesting fauna, and sanitation actions.

Sources and further reading

• https://dlnr.hawaii.gov/forestry/files/2013/02/NPK_FINAL_small-file.pdf
• https://dlnr.hawaii.gov/dofaw/kauai/learn/