XXXVIlI YORKSHIRE—VERTEBRATE FAUNA. 
The Cuneate-tailed Gull—of which not half-a-dozen specimens 
are known to exist—is specially interesting from its extreme rarity ; 
and although there is a discrepancy of dates in the two versions 
published at the time of the occurrence, there is no ground for 
doubting its genuineness. 
Amongst the species which have occurred in Yorkshire of 
which very few British examples are known, may be cited the 
Rock-Thrush, Orphean Warbler, White-spotted Bluethroat, Tawny 
Pipit, Pine-Grosbeak, White-winged Crossbill, Red-winged Starling, 
Eagle Owl, Greenland and Iceland Falcons, Swallow-tailed Kite, 
American Bittern, Red-breasted Goose, Polish Swan, Ruddy 
Sheldrake, Buffel-headed Duck, King Eider, Steller’s Duck, 
Barbary Partridge, Andalusian Hemipode, Yellowshank, Broad- 
billed Sandpiper, Gull-billed Tern, and White-winged Black Tern. 
Treating of Yorkshire birds generally, it may be remarked that 
many resident birds are to a greater or less extent migratory, 
shifting their quarters from one locality to another according to 
the season, as for example the Curlew, which breeds on the high 
moors in the summer and retires to the shores during the winter, 
while the Thrush and Pied Wagtail remain through that season in 
much reduced numbers. With some species, as the Long-eared 
Owl, Kestrel, and Reed-Bunting, it is very possible that the 
individuals found in summer migrate southwards for the winter, 
and are replaced by others from localities still further north. 
Such a circumstance, however, would not in the least militate 
against the claim of the species to be considered as resident. 
On the other hand, there are species—true winter visitants, 
though ranked in some county lists as residents—of which a few are 
found in the district throughout the year, but they cannot be 
regarded as ‘residents’ in the true sense of the term, for the 
individuals remaining through the summer are immature and non- 
breeding birds. These remarks are applicable to (amongst other 
species) the Turnstone (of which about a score remain at Spurn 
throughout the summer), the Dunlin, Common Scoter, Common 
and Lesser Black-backed Gulls, and Red-throated Diver, all of 
which are to be found in more or less numbers on or off the 
coast at all seasons. The fact of individuals remaining in this 
