U.S. Outlying Islands

50 threatened species · Biodiversity Intelligence Dashboard

Threatened Species

50

CR + EN + VU

Critically Endangered

10

Highest risk

Endangered

13

Very high risk

Vulnerable

27

High risk

Declining

44%

22 species

Category Breakdown
CR 10
EN 13
VU 27
CR: 10
EN: 13
VU: 27

Critically Endangered

1020%

Extremely high risk of extinction in the wild.

Endangered

1326%

Very high risk of extinction in the wild.

Vulnerable

2754%

High risk of extinction in the wild.

Threatened total — 50 species

Species by Group
🐟

fishes

19

19 threatened

🪸

corals

10

10 threatened

🌱

plants

9

9 threatened

🐦

birds

6

6 threatened

🪱

other invertebrates

4

4 threatened

🐾

mammals

1

1 threatened

🐢

reptiles

1

1 threatened

Global Share

0.09%

of globally threatened species

Country Rank

#208

of 250 countries

Endemic Threatened

0

Found only here

Top Threats
1.Fishing & harvesting aquatic resources20 species
2.Habitat shifting & alteration14 species
3.Recreational activities10 species
4.Invasive non-native/alien species/diseases10 species
5.Logging & wood harvesting9 species
6.Type Unknown/Unrecorded (pollution)9 species
7.Coastal development and sedimentation7 species
8.Problematic native species/diseases7 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). U.S. Outlying Islands: Biodiversity Dashboard. SpeciesRadar: Intelligence for Earth's Biodiversity. Available at: https://speciesradar.org/countries/UM

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 U.S. Outlying Islands?
U.S. Outlying Islands has 50 threatened species recorded on SpeciesRadar — 10 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 U.S. Outlying Islands have?
Of the 50 threatened species in U.S. Outlying Islands, 10 are Critically Endangered, 13 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 U.S. Outlying Islands?
Among the 10 Critically Endangered species in U.S. Outlying Islands, Montipora patula 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 U.S. Outlying Islands?
SpeciesRadar does not yet catalogue protected areas for U.S. Outlying Islands. 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 U.S. Outlying Islands?
The most affected groups in U.S. Outlying Islands, by number of threatened species, are fishes (19), corals (10), and plants (9). The full taxonomic breakdown is shown on the country dashboard.
What are the biggest threats to wildlife in U.S. Outlying Islands?
The leading threats to threatened species in U.S. Outlying Islands are fishing & harvesting aquatic resources, habitat shifting & alteration, recreational activities, and invasive non-native/alien species/diseases. Each threat is mapped to the species it affects in the country's threat breakdown.
How many of U.S. Outlying Islands's threatened species have declining populations?
22 of U.S. Outlying Islands'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 U.S. Outlying Islands compare to other countries for threatened species?
U.S. Outlying Islands ranks #208 of 250 countries by number of threatened species, and accounts for roughly 0.09% 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 U.S. Outlying Islands 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 U.S. Outlying Islands profile — species, national red list, and protected areas — can be downloaded as a CSV spreadsheet or a branded PDF report.