ballena
52MEDIO AMBIENTE- MT
5211medio natural - BT1 mamífero marino
- BT2 mamífero salvaje
- BT3 fauna
- BT4 vida silvestre
Mapping
- EXM agrovoc: Agrovoc (FAO - Food and Agriculture Organization)
- EXM gemet: GEMET (GEneral Multilingual Environmental Thesaurus - EEA)
- EXM zbw: ZBW (Thesaurus for Econmics)
Spanish)