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
🐾

mammals

1

1 threatened

🐦

birds

19

19 threatened

🐢

reptiles

1

1 threatened

🐟

fishes

10

10 threatened

🦗

insects

69

69 threatened

🌱

plants

21

21 threatened

Global Share

0.27%

of globally threatened species

Country Rank

#157

of 277 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 in the SpeciesRadar database — 28 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 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 CR species is filterable on the country page.
What protected areas exist in Guernsey?
Protected area coverage for Guernsey is summarised on the country dashboard, drawing on the World Database on Protected Areas (WDPA) and national park designations.