From WikiBird

Divers

The diver is a type of aquatic bird found in many parts of North America and northern Europe. A diver is the size of a large duck, to which it is unrelated; its plumage is largely grey or black, and it has a spear-shaped bill. The divers compose a genus (Gavia), family (Gaviidae), and order (Gaviiformes) all their own.

• Red-throated Diver - Gavia stellata A
• Black-throated Diver - Gavia arctica A
• Great Northern Diver - Gavia immer A
• White-billed Diver - Gavia adamsii A rare