36 BIRDS OF THE NEW YORK CITY REGION 



summer residents greatly outweighs the accessions from the 

 north in the way of new species. Many summer residents 

 are now on the move, but this is difficult to detect except in 

 places where they do not breed. Species, however, such as 

 the Worm-eating and Golden-winged Warblers, which are 

 rare as transients, are more often recorded in this month. 

 Those birds which regularly arrive from the north are : 



(Aug. 1-Aug. 30) 



Great Blue Heron Magnolia Warbler 



Sora Bay-breasted Warbler 



Olive-sided Flycatcher Blackburnian Warbler 



Yellow-bellied Flycatcher Northern Water-Thrush 



Golden-winged Warbler Mourning Warbler 



Tennessee Warbler Wilson's Warbler 



Cape May Warbler Canadian Warbler 



Red-breasted Nuthatch (irregular) 



Of these species, the Heron, Sora, Yellow-bellied Fly- 

 catcher, Water-thrush, and Canadian Warbler regularly 

 arrive before August 15, the others usually not until after the 

 20th. Birds do not come in " waves" in August as they do 

 in May. The migration of each species is extended over a 

 much longer period, consequently fewer individuals are 

 present on any one day, and a bird is often recorded less 

 frequently in fall than in spring, in spite of the fact that the 

 total number of individuals passing through is approximately 

 the same. The absence of song, the change to a more obscure 

 plumage, and the fact that the vegetation is at its maximum 

 of luxuriance add to the difficulties of the student. It is by all 

 odds the least known and the most interesting season of the 

 year. On the coast the migration of Terns and Shore-birds 

 reaches its maximum. The Loon, Cormorant, Ring-billed 

 Gull and Jaegers arrive from the north. 



The great apparent scarcity of birds in August is partially 

 relieved in early September. More transients have arrived. 

 The number of summer residents is also greatly reenforced by 

 individuals appearing from more northern nesting grounds. 



