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
🐾

mammals

1

1 threatened

🐦

birds

6

6 threatened

🐢

reptiles

1

1 threatened

🐟

fishes

19

19 threatened

🌱

plants

9

9 threatened

Global Share

0.09%

of globally threatened species

Country Rank

#209

of 277 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 in the SpeciesRadar database — 10 of those are Critically Endangered (CR), facing an extremely high risk of extinction. The figures combine IUCN Red List data with national red list assessments where available.
What is the most endangered species in U.S. Outlying Islands?
Among the 10 Critically Endangered species in U.S. Outlying Islands, Short-eared Owl (Asio flammeus) is one of the most at-risk — featured prominently on the country dashboard. The full list of CR species is filterable on the country page.
What protected areas exist in U.S. Outlying Islands?
Protected area coverage for U.S. Outlying Islands is summarised on the country dashboard, drawing on the World Database on Protected Areas (WDPA) and national park designations.