定義： A taxon is Vulnerable when the best available evidence indicates that it meets any of the criteria A to E for Vulnerable, and it is therefore considered to be facing a high risk of extinction in the wild.
定義： The first post-fertilization life stage of many organisms. The developing organism is enclosed by a membrane and possibly a hard shell and is not yet motile. Followed by hatching and either larval or other juvenile life stages.
定義： A group of species that exploit the same food resources, and/or use the same feeding or foraging methods. http://en.wikipedia.org/wiki/Guild_(ecology)
