Clades:
Charadriiformes;
Columbaves;
Aves;
Sauropsida;
Animals;
Kingdoms.
Members: x Aethia cristatella; x Alca torda; x Brachyramphus brevirostris; x Cepphus carbo; x Cerorhinca monocerata; x Fratercula arctica; x Ptychoramphus aleuticus; x Synthliboramphus antiquus; x Uria lomvia.