Contains
- guillemot
Small black or brown speckled auks of northern seas.
- auklet
Any of several small auks of the northern Pacific coasts.
- razorbill
Black-and-white northern Atlantic auk having a compressed sharp-edged bill.
- little auk
Small short-billed auk abundant in Arctic regions.
- great auk
Large flightless auk of rocky islands off northern Atlantic coasts; extinct.