Dresser/Europe, Charadriiformes:  Stercorariidae  (continued)

Dresser, History of the Birds of Europe

Charadriiformes:  Stercorariidae  (continued)

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609.

Common Skua.

Stercorarius catarrhactes.

610.

Pomatorhine Skua.

Stercorarius pomatorhinus.

611.

Richardson's Skua.

Young, and Dark Form.