Species which qualify for one or more of the following are species of conservation concern:
- threatened endemic and other globally threatened species
- species where the UK has more that 25% of the world or appropriate biogeographical population
- species where numbers or range have declined by more than 25% in the last 25 years
- in some instances where the species is found in fewer than 15 ten km squares in the UK
- species listed in the EU Birds or Habitats Directives, the Bern, Bonn or CITES Conventions, or under the Wildlife and Countryside Act 1981 and the Wildlife Order (Northern Ireland) 1985
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