Children (14 direct children, 16 direct and indirect children):
Red-throated diver
Red-throated loon
Black-throated diver
(tree size 2)
Black-throated loon
Common loon
Great northern loon
Yellow-billed diver
Yellow-billed loon
Pacific diver
Pacific loon
Gavia fortis
Gavia moldavica
Gavia palaeodytes
Gavia brodkorbi
Gavia concinna
Gavia egeriana
Gavia howardae
Gavia paradoxa
Gavia roseiventris