Pacific rat

Kauaʻi evidence

Kauaʻi rat occurrence is supported at genus level by management plans; species-level distribution should be strengthened site by site.

Names and classification

Scientific name

Rattus exulans

Common names

Pacific rat

Record type

species

Kauaʻi occurrence and status

Kauaʻi occurrence

Confirmed on Kauaʻi

Origin

Introduced; Polynesian-era arrival

Conservation status

Not listed

Evidence date

2026-09-13

Evidence limits

Uncertainty is retained at site, abundance, and trend levels.

Habitat and ecology

Habitats

forest · shrubland · agricultural land · coastal habitats

Food and resource needs

seeds · fruit · invertebrates · eggs

Reproduction

sheltered nests

Shelter

vegetation · crevices · structures

Threats and conservation

Threats

predation on native fauna · seed loss · competition

Conservation actions

targeted trapping · toxicant programs · biosecurity

Monitoring

tracking tunnels · snap-trap indices · camera traps

Data gaps

Site-scale abundance and trend coverage remains uneven.

Process and seasonal context

Seasonal timing

Established

Seasonal description

Kauaʻi status: Confirmed on Kauaʻi. Ecological relationships include native bird nesting, invertebrates, and plant recruitment.

Sources and further reading

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