Tonga

40 threatened species · Biodiversity Intelligence Dashboard

Threatened Species

40

CR + EN + VU

Critically Endangered

6

Highest risk

Endangered

7

Very high risk

Vulnerable

27

High risk

Declining

57%

23 species

Category Breakdown
CR 6
EN 7
VU 27
CR: 6
EN: 7
VU: 27

Critically Endangered

615%

Extremely high risk of extinction in the wild.

Endangered

718%

Very high risk of extinction in the wild.

Vulnerable

2768%

High risk of extinction in the wild.

Threatened total — 40 species

Species by Group
🐟

fishes

16

16 threatened

🪸

corals

11

11 threatened

🐚

molluscs

5

5 threatened

🪱

other invertebrates

4

4 threatened

🌱

plants

2

2 threatened

🍄

fungi

2

2 threatened

Global Share

0.07%

of globally threatened species

Country Rank

#222

of 250 countries

Endemic Threatened

0

Found only here

Top Threats
1.Fishing & harvesting aquatic resources26 species
2.Habitat shifting & alteration12 species
3.Logging & wood harvesting8 species
4.Recreational activities8 species
5.Coastal development and sedimentation7 species
6.Type Unknown/Unrecorded (pollution)6 species
7.Annual & perennial non-timber crops6 species
8.Agricultural & forestry effluents6 species

How to Cite

IUCN: IUCN (2025). The IUCN Red List of Threatened Species. Version 2025-1. Available at: https://www.iucnredlist.org. doi:10.2305/IUCN.UK.2025-1.RLTS

GBIF: GBIF.org (2025). GBIF Home Page. Available at: https://www.gbif.org

This page: SpeciesRadar (2026). Tonga: Biodiversity Dashboard. SpeciesRadar: Intelligence for Earth's Biodiversity. Available at: https://speciesradar.org/countries/TO

Species counts reflect IUCN Red List threatened categories (CR, EN, VU). · Full citation guide & data usage terms

Frequently asked questions

How many threatened species are in Tonga?
Tonga has 40 threatened species recorded on SpeciesRadar — 6 of those are Critically Endangered, facing an extremely high risk of extinction. The figures combine IUCN Red List data with national red list assessments where available.
How many Critically Endangered, Endangered, and Vulnerable species does Tonga have?
Of the 40 threatened species in Tonga, 6 are Critically Endangered, 7 are Endangered, and 27 are Vulnerable. Together these three IUCN Red List categories make up the "threatened" total.
What is the most endangered species in Tonga?
Among the 6 Critically Endangered species in Tonga, Black Teatfish (Holothuria nobilis) is one of the most at-risk — featured prominently on the country dashboard. The full list of Critically Endangered species is filterable on the Species tab.
What protected areas exist in Tonga?
SpeciesRadar does not yet catalogue protected areas for Tonga. Where available, protected-area data is drawn from the World Database on Protected Areas (WDPA) and national designations.
Which animal and plant groups are most threatened in Tonga?
The most affected groups in Tonga, by number of threatened species, are fishes (16), corals (11), and molluscs (5). The full taxonomic breakdown is shown on the country dashboard.
What are the biggest threats to wildlife in Tonga?
The leading threats to threatened species in Tonga are fishing & harvesting aquatic resources, habitat shifting & alteration, logging & wood harvesting, and recreational activities. Each threat is mapped to the species it affects in the country's threat breakdown.
How many of Tonga's threatened species have declining populations?
23 of Tonga's threatened species have populations that are still declining. Reversing these trends is the central focus of the conservation work the country dashboard tracks.
How does Tonga compare to other countries for threatened species?
Tonga ranks #222 of 250 countries by number of threatened species, and accounts for roughly 0.07% of all threatened species tracked worldwide. Threat is geographically concentrated, so a high rank reflects both rich biodiversity and intense pressure on it.
Where does the data for Tonga come from, and can I download it?
SpeciesRadar draws on the IUCN Red List, the Global Biodiversity Information Facility (GBIF), the World Database on Protected Areas, and national red lists. Every table on the Tonga profile — species, national red list, and protected areas — can be downloaded as a CSV spreadsheet or a branded PDF report.