British Indian Ocean Territory

39 threatened species · Biodiversity Intelligence Dashboard

Threatened Species

39

CR + EN + VU

Critically Endangered

5

Highest risk

Endangered

10

Very high risk

Vulnerable

24

High risk

Declining

79%

31 species

Category Breakdown
CR 5
EN 10
VU 24
CR: 5
EN: 10
VU: 24

Critically Endangered

513%

Extremely high risk of extinction in the wild.

Endangered

1026%

Very high risk of extinction in the wild.

Vulnerable

2462%

High risk of extinction in the wild.

Threatened total — 39 species

Species by Group
🐟

fishes

24

24 threatened

🪸

corals

7

7 threatened

🐦

birds

4

4 threatened

🪱

other invertebrates

2

2 threatened

🐾

mammals

1

1 threatened

🐢

reptiles

1

1 threatened

Global Share

0.07%

of globally threatened species

Country Rank

#223

of 250 countries

Endemic Threatened

0

Found only here

Top Threats
1.Fishing & harvesting aquatic resources27 species
2.Habitat shifting & alteration15 species
3.Logging & wood harvesting11 species
4.Type Unknown/Unrecorded (pollution)9 species
5.Annual & perennial non-timber crops6 species
6.Housing & urban areas5 species
7.Recreational activities5 species
8.Marine & freshwater aquaculture5 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). British Indian Ocean Territory: Biodiversity Dashboard. SpeciesRadar: Intelligence for Earth's Biodiversity. Available at: https://speciesradar.org/countries/IO

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 British Indian Ocean Territory?
British Indian Ocean Territory has 39 threatened species recorded on SpeciesRadar — 5 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 British Indian Ocean Territory have?
Of the 39 threatened species in British Indian Ocean Territory, 5 are Critically Endangered, 10 are Endangered, and 24 are Vulnerable. Together these three IUCN Red List categories make up the "threatened" total.
What is the most endangered species in British Indian Ocean Territory?
Among the 5 Critically Endangered species in British Indian Ocean Territory, Chagos Brain Coral (Ctenella chagius) 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 British Indian Ocean Territory?
SpeciesRadar does not yet catalogue protected areas for British Indian Ocean Territory. 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 British Indian Ocean Territory?
The most affected groups in British Indian Ocean Territory, by number of threatened species, are fishes (24), corals (7), and birds (4). The full taxonomic breakdown is shown on the country dashboard.
What are the biggest threats to wildlife in British Indian Ocean Territory?
The leading threats to threatened species in British Indian Ocean Territory are fishing & harvesting aquatic resources, habitat shifting & alteration, logging & wood harvesting, and type unknown/unrecorded (pollution). Each threat is mapped to the species it affects in the country's threat breakdown.
How many of British Indian Ocean Territory's threatened species have declining populations?
31 of British Indian Ocean Territory'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 British Indian Ocean Territory compare to other countries for threatened species?
British Indian Ocean Territory ranks #223 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 British Indian Ocean Territory 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 British Indian Ocean Territory profile — species, national red list, and protected areas — can be downloaded as a CSV spreadsheet or a branded PDF report.