| Specie | Subspecies |
|---|---|
| Red-throated Loon (Gavia stellata) | monotypic |
| Black-throated Loon (Gavia arctica) | 2 |
| Pacific Loon (Gavia pacifica) | monotypic |
| Common Loon (Gavia immer) | monotypic |
| Yellow-billed Loon (Gavia adamsii) | monotypic |
Species: #5
Species and subspecies: #6
