 |
| |||
| dunbird (Aythya ferina); pochard (Aythya ferina) | |||
| European pochard (Aythya ferina); common pochard (Aythya ferina); Common pochard (Aythya ferina tatarica) | |||
| красноголовый нырок: 11 phrases in 4 subjects |
| Biology | 1 |
| General | 1 |
| Ornithology | 5 |
| Zoology | 4 |
|
| |||
| dunbird (Aythya ferina); pochard (Aythya ferina) | |||
| European pochard (Aythya ferina); common pochard (Aythya ferina); Common pochard (Aythya ferina tatarica) | |||
| красноголовый нырок: 11 phrases in 4 subjects |
| Biology | 1 |
| General | 1 |
| Ornithology | 5 |
| Zoology | 4 |