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| Noord-Amerikaanse otter (Lutra canadensis); Canadese otter (Lutra canadensis) | |||
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| Noord-Amerikaanse otter (Lontra canadensis, Lutra canadensis) | |||
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| gewone otters (geslacht, Lutra) | |||
| river otter: 3 phrases in 2 subjects |
| Natural resourses and wildlife conservation | 2 |
| Zoology | 1 |