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Terms containing bittern | all forms
| Subject | English | Spanish |
| nat.sc. | American bittern | avetoro lentiginoso (Botaurus lentiginosus) |
| nat.res. | least bittern | avetorillo menor (Ixobrychus exilis) |
| nat.res. | lesser bittern | avetorillo menor (Ixobrychus exilis) |
| nat.res. | little bittern | avetorillo común (Ixobrychus minutus) |
| nat.res. | Schrenck's little bittern | avetorillo de Wagler (Ixobrychus eurhythmus) |