Parsed documentation:
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lifeStage (http://rs.tdwg.org/dwc/terms/lifeStage)

@return [String]
The age class or life stage of the species for which the vernacular
name applies. Best practice is to utilise a controlled list of terms for
this value.

Vocabulary: http://rs.gbif.org/vocabulary/gbif/life_stage.xml

Example: ‘juvenile" is the life stage of the fish Pomatomus saltatrix
for which the name "snapper blue" refers.’
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