30 ELEMENTS OF ORNITHOLOGY, 
There are also Robber-gulls, called Skuas, and the Great Skua 
(Stercorarius catarrhactes) breeds in Iceland, the F aroes, and the 
Fig. 28. 

Fig. 29. 

Head of the American Skimmer (Rhynchops nigra). 
Shetland Islands. There are three curious Birds called Skim- 
mers or Scissor-bills—one in Asia, one in Africa, and one in 
America. The last of these (Zthynchops nigra) has been observed 
