Great Crested Tern

Kauaʻi evidence

A Hawaiʻi-level record is available, but the species needs a documented Kauaʻi observation before local ecological conclusions are drawn.

Occurrence evidence

island_checklist_no_kauai_code

Names and classification

Scientific name

Thallasseus bergii

Common names

Great Crested Tern

Record type

Species

Kauaʻi occurrence and status

Kauaʻi occurrence

No Kauaʻi occurrence code in 2017 island checklist; further evidence needed

Origin

Vagrant visitor

Conservation status

Not assessed

Evidence date

2026-09-13

Evidence limits

Kauaʻi occurrence or ecological use remains uncertain

Habitat and ecology

Habitats

Shorelines · Coastal habitat · Offshore waters and islands · Urban areas

Food and resource needs

For Kauaʻi, Great Crested Tern has no standing local food dependency until an occurrence is validated. If recorded, attach the observation to transient access to marine prey such as fish, squid, crustaceans, areas schooling prey, carrion, or kleptoparasitic food pathways depending on the seabird role.

Reproduction

Breeding on Kauaʻi is not established; seasonal resting and foraging habitat may be relevant.

Shelter

Shelter and structure within shorelines, coastal habitat, offshore waters and islands.

Threats and conservation

Threats

Coastal disturbance, fishery/prey availability, light attraction, marine debris, disease, and rare-record review are open questions

Conservation actions

Document date, place, observer, habitat, and supporting media · Confirm identification and Kauaʻi occurrence before local conservation use

Monitoring

Document date, place, observer, habitat, behavior, and supporting media for any Kauaʻi observation.

Data gaps

A documented Kauaʻi observation with date, place, observer, and supporting media is needed

Process and seasonal context

Seasonal timing

Rare Or Unresolved Hawaiian Coastal Pelagic Record Needs Kauai Review

Seasonal description

Great Crested Tern (Thallasseus bergii) appears in the wider Hawaiian bird catalog, but the Bishop Museum's 2017 island checklist has no Kauaʻi occurrence code for it. An island-specific record is needed before claiming local presence.

Sources and further reading

• https://westernfieldornithologists.org/wp-content/uploads/2020/06/Hawaiian_Islands_Bird_Checklist-Jan-2019.pdf
• https://dlnr.hawaii.gov/wildlife/sanctuaries/kaua%CA%BBi-offshore-islets-seabird-sanctuaries/
• https://hawaiibirdingtrails.hawaii.gov/birding_hotspot/salt-pond-beach-park/
• https://hawaiibirdingtrails.hawaii.gov/birding_hotspot/kilauea-point-national-wildlife-refuge/
• https://hbs.bishopmuseum.org/birds/rlp-monograph/SEHIlist.htm

Explore field guides

• Kauaʻi Birds