Gaviiformes

Bird order - Loons are the outgroup to penguins (Sphenisciformes) + tube-nosed seabirds (Procellariiformes) (Prum et al. 2015).

Gaviidae

Gavia Red-throated Loon

Gavia Pacific Loon

Gavia Common Loon

Gavia Yellow-billed Loon

Gavia Black-throated Loon