Relationship of NZTCS categories
Panels of experts from New Zealand’s scientific community determine conservation statuses using the following assessments:
- What’s the current population size? This can be the number of breeding adults or the area of occupied habitat.
- How much is the population estimated to rise or fall over either the next three generations or 10 years (whichever is longer)?
- If the population is stable, has it declined in the past?
- Is the population state a result of human-induced effects?
Learn more about classification criteria in the New Zealand Threat Classification System manual.
Threatened species have the greatest risk of extinction.
- Nationally Critical: most severely threatened, facing an immediate high risk of extinction.
- Nationally Endangered: facing high risk of extinction in the short term.
- Nationally Vulnerable: facing a risk of extinction in the medium term.
At Risk species aren’t considered Threatened, but they could quickly become so if declines continue, or if a new threat arises.
- Declining: population declining but still common.
- Recovering: small population but increasing after previously declining.
- Relict: small population stabilised after declining.
- Naturally Uncommon: naturally small population and therefore susceptible to harmful influences.