Definition: A taxon is Endangered when the best available evidence indicates that it meets any of the \r\ncriteria A to E for Endangered, and it is therefore considered to be facing a very high risk of extinction in the wild.
Comment: Preliminary definition. The semantics and definitions of "mediterranean", "subtropical", "tropical", "temperate", "polar", and similar climate types may be transferred to an "environmental condition" class once the semantics of this class have been established.
Definition: Organism produces a vocalization that is either structurally more complex or that serves a different function (namely, being used in courtship or pair bond maintenance) than any vocalizations described for that organism that are referred to as "calls" in the literature.