The area must have a definable boundary within the character of habitats, biological communities, and/or management issues have more in common with each other than they do with those in adjacent areas.
Category****Criteria
Endangerment
An AZE site must contain at least one Endangered or Critically Endangered species, as listed on the IUCN Red List.
Irreplaceability
An AZE site should only be designated if it is the sole area where and Endangered or Critically Endangered species occurs, contains the overwhelmingly significant known resident population (>95%) of the Endangered or Critically Endangered species, or contains the overwhelmingly significant known population (>95%) for one life history segment (e.g. breeding or wintering) of the Endangered or Critically Endangered species.
Discreteness
The area must have a definable boundary within the character of habitats, biological communities, and/or management issues have more in common with each other than they do with those in adjacent areas.Table 2. Criteria for identifying sites for protection of Endangered or Critically Endangered species as defined by the AZE.