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| Order | Family | English Common Name | Spanish Common Name | Portuguese Common Name | Scientific Name | Belonging | Records | Conservation status | Notes | ||
| 1 | Anseriformes | Anatidae | Long-tailed Duck | Pato Cola Larga | Clangula hyemalis | Native | 1 |
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| 2 | Red-breasted Merganser | Mergo Copetón | Mergus serrator | Native | 1 |
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| 3 | Greater Scaup | Porrón Bastardo | Aythya marila | Native | 1 |
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| 4 | Suliformes | Phalacrocoracidae | Great Cormorant | Cormorán Grande | Phalacrocorax carbo | Native | 1 |
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