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| Birkhuhn n (Lyrurus tetrix, Tetrao tetrix tetrix) | |||
| Birkhahn m (Lyrurus tetrix, Tetrao tetrix) | |||
| Birkhuhn n. (Tetrao tetrix (=Lyrurus tetrix)) | |||
| Birkhuhn n (Tetrao tetrix) | |||
| korhoen: 2 phrases in 2 subjects |
| Natural resourses and wildlife conservation | 1 |
| Zoology | 1 |