Guernsey

149 threatened species · Biodiversity Intelligence Dashboard

Threatened Species

149

CR + EN + VU

Critically Endangered

28

Highest risk

Endangered

35

Very high risk

Vulnerable

86

High risk

Declining

11%

17 species

Category Breakdown
CR 28
EN 35
VU 86
CR: 28
EN: 35
VU: 86

Critically Endangered

2819%

Extremely high risk of extinction in the wild.

Endangered

3523%

Very high risk of extinction in the wild.

Vulnerable

8658%

High risk of extinction in the wild.

Threatened total — 149 species

Species by Group
🦗

insects

69

69 threatened

🌱

plants

21

21 threatened

🐦

birds

19

19 threatened

🐚

molluscs

14

14 threatened

🐟

fishes

10

10 threatened

🪱

other invertebrates

5

5 threatened

🦀

crustaceans

5

5 threatened

🕷️

arachnids

3

3 threatened

🐾

mammals

1

1 threatened

🐢

reptiles

1

1 threatened

🪸

corals

1

1 threatened

Global Share

0.27%

of globally threatened species

Country Rank

#156

of 250 countries

Endemic Threatened

0

Found only here

Top Threats
1.Urban development and infrastructure expansion19 species
2.Habitat loss and fragmentation14 species
3.Fishing & harvesting aquatic resources14 species
4.Agricultural intensification and pesticide use11 species
5.Agricultural intensification11 species
6.Light pollution disrupting nocturnal behavior10 species
7.Agricultural intensification and habitat conversion9 species
8.Logging & wood harvesting9 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). Guernsey: Biodiversity Dashboard. SpeciesRadar: Intelligence for Earth's Biodiversity. Available at: https://speciesradar.org/countries/GG

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 Guernsey?
Guernsey has 149 threatened species recorded on SpeciesRadar — 28 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 Guernsey have?
Of the 149 threatened species in Guernsey, 28 are Critically Endangered, 35 are Endangered, and 86 are Vulnerable. Together these three IUCN Red List categories make up the "threatened" total.
What is the most endangered species in Guernsey?
Among the 28 Critically Endangered species in Guernsey, Erratic Ant (Tapinoma erraticum) 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 Guernsey?
SpeciesRadar does not yet catalogue protected areas for Guernsey. 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 Guernsey?
The most affected groups in Guernsey, by number of threatened species, are insects (69), plants (21), and birds (19). The full taxonomic breakdown is shown on the country dashboard.
What are the biggest threats to wildlife in Guernsey?
The leading threats to threatened species in Guernsey are urban development and infrastructure expansion, habitat loss and fragmentation, fishing & harvesting aquatic resources, and agricultural intensification and pesticide use. Each threat is mapped to the species it affects in the country's threat breakdown.
How many of Guernsey's threatened species have declining populations?
17 of Guernsey'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 Guernsey compare to other countries for threatened species?
Guernsey ranks #156 of 250 countries by number of threatened species, and accounts for roughly 0.27% 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 Guernsey 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 Guernsey profile — species, national red list, and protected areas — can be downloaded as a CSV spreadsheet or a branded PDF report.