Guam

88 threatened species · Biodiversity Intelligence Dashboard

Threatened Species

88

CR + EN + VU

Critically Endangered

17

Highest risk

Endangered

36

Very high risk

Vulnerable

35

High risk

Declining

74%

65 species

Category Breakdown
CR 17
EN 36
VU 35
CR: 17
EN: 36
VU: 35

Critically Endangered

1719%

Extremely high risk of extinction in the wild.

Endangered

3641%

Very high risk of extinction in the wild.

Vulnerable

3540%

High risk of extinction in the wild.

Threatened total — 88 species

Species by Group
🪸

corals

21

21 threatened

🐟

fishes

18

18 threatened

🌱

plants

16

16 threatened

🐦

birds

12

12 threatened

🐚

molluscs

6

6 threatened

🪱

other invertebrates

5

5 threatened

🐾

mammals

4

4 threatened

🐢

reptiles

2

2 threatened

🍄

fungi

2

2 threatened

🐸

amphibians

1

1 threatened

🦀

crustaceans

1

1 threatened

Global Share

0.16%

of globally threatened species

Country Rank

#185

of 250 countries

Endemic Threatened

6

Found only here

Conservation Outlook

Outlook: Deteriorating

Guinea's biodiversity significance stems from its position within the Upper Guinea Forest ecosystem, part of the West African Forests biodiversity hotspot. The country encompasses diverse biomes from the Guinea Highlands' montane forests to Atlantic coastal mangroves and the transition zone between forest and savanna ecosystems. The Fouta Djallon plateau serves as the "water tower of West Africa," supporting unique highland vegetation and endemic species.

According to IUCN Red List 2025 data, all five assessed species in Guinea are threatened, representing 100% plant species under evaluation. The limited assessment scope suggests significant data gaps in understanding the country's full biodiversity status. Primary threats include deforestation driven by agricultural expansion, particularly slash-and-burn farming practices, and mining activities targeting bauxite deposits in forested regions.

The Fouta Djallon faces degradation from overgrazing and unsustainable land use practices.

Guinea has established several protected areas, including Badiar National Park and Mount Nimba Strict Nature Reserve (shared with Côte d'Ivoire and Liberia), a UNESCO World Heritage site protecting endemic species. However, enforcement capacity remains limited. Community-based conservation initiatives are emerging in some regions, focusing on sustainable forest management.

The trajectory appears concerning given the complete threat status of assessed species, though expanded scientific surveys may reveal a more comprehensive picture of conservation needs.

Upper Guinea ForestGuinea Highlands Montane ForestFouta Djallon PlateauAtlantic Coastal MangrovesGuinea SavannaRiparian Forests
Top Threats
1.Fishing & harvesting aquatic resources39 species
2.Habitat shifting & alteration34 species
3.Invasive non-native/alien species/diseases31 species
4.Annual & perennial non-timber crops26 species
5.Logging & wood harvesting26 species
6.Type Unknown/Unrecorded (pollution)24 species
7.Problematic native species/diseases19 species
8.Recreational activities18 species

Protected Areas

13 areas · 15,763 km²

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). Guam: Biodiversity Dashboard. SpeciesRadar: Intelligence for Earth's Biodiversity. Available at: https://speciesradar.org/countries/GU

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 Guam?
Guam has 88 threatened species recorded on SpeciesRadar — 17 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 Guam have?
Of the 88 threatened species in Guam, 17 are Critically Endangered, 36 are Endangered, and 35 are Vulnerable. Together these three IUCN Red List categories make up the "threatened" total.
What is the most endangered species in Guam?
Among the 17 Critically Endangered species in Guam, 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 Guam?
Guam has 13 protected areas catalogued on SpeciesRadar, sourced from the WDPA and national designations. Notable sites include Mont Nimba Biosphere Reserve, Ziama Massif Biosphere Reserve, Alcatraz Island Marine Protected Area, and Tristao Islands Marine Protected Area, among 9 others. The full list is sortable and downloadable on the Protected Areas tab.
Which animal and plant groups are most threatened in Guam?
The most affected groups in Guam, by number of threatened species, are corals (21), fishes (18), and plants (16). The full taxonomic breakdown is shown on the country dashboard.
What are the biggest threats to wildlife in Guam?
The leading threats to threatened species in Guam are fishing & harvesting aquatic resources, habitat shifting & alteration, invasive non-native/alien species/diseases, and annual & perennial non-timber crops. Each threat is mapped to the species it affects in the country's threat breakdown.
How many threatened species are found only in Guam?
Guam has 6 threatened species that are endemic — found nowhere else on Earth. Because their entire global population depends on this one country, they are especially vulnerable to local habitat loss.
How many of Guam's threatened species have declining populations?
65 of Guam'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 Guam compare to other countries for threatened species?
Guam ranks #185 of 250 countries by number of threatened species, and accounts for roughly 0.16% 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 Guam 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 Guam profile — species, national red list, and protected areas — can be downloaded as a CSV spreadsheet or a branded PDF report.