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| Zwergschwan m (Cygnus bewickii) | |||
| Zwergschwan m (Cygnus columbianus, Cygnus bewickii); Zwergschwan m (Cygnus bewickii, Olor bewickii) | |||
| Zwergschwan m (Cygnus columbianus) | |||
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| Zwergschwan m (Cygnus columbianus) | |||
| bewick' s swan: 1 phrase in 1 subject |
| Natural resourses and wildlife conservation | 1 |