1. Extinct
|
Taxa not seen in nature
during the last 50 years |
2. Endangered
|
Taxa in danger of
extinction because survival is unlikely if current causal factors
continue to operate unchecked. Includes taxa that may already be
extinct but have been seen within the last 50 years as well as those
that are in immediate danger. |
3. Vulnerable
|
Taxa thought likely to
become endangered in the near future if current causal factors
continue to operate. |
4. Rare
|
Taxa at risk due to
small world population sizes but that are not currently thought to be
“vulnerable” or “endangered.” |
5. Indeterminate
|
Taxa for which there is
insufficient data to determine, but are thought to be covered under
categories 2 through 4. |
6. Secure
|
Taxa in any of
categories 2 through 5 that are now considered to be demonstrably
secure because of effective conservation measures. |