Reports of Field Agents 425 



frightened from the nest, they very foohshly fly a considerable distance to sea 

 and often remain for several minutes at a time. This opjiortunity is quickly 

 seized by the Crows, and in an almost incredibly short time the Cormorants' 

 nest is empty. Many of the breeding birds have little or no white on the flanks, 

 and, in many cases, the nuptial plumes on the neck are not present, or are 

 very poorly developed. The immatures, that is, the birds raised the previous 

 year, are abundant all over the bay, following the schools of small fish. The 

 breeding birds are not seen at any great distance from the nesting colony. 

 Estimated number of pairs nesting on the reservation, 150. 

 IIcBmatopus bachmani. Black Oyster-catcher. 



At least four pairs of these birds breed on rocky points of the island. At 

 the time of my visit, the young were full grown. 



Summary of Breeding Water-birds. 



Pairs 



Tufted Puffin 2,000 



Horned Puffin 12 



Rhinoceros A.uklet 75 



Pigeon Guillemot 150 



California Murre 300 



Glaucous-winged Gull 300 



Forked-tailed Petrel 2,000 



Eeal Patrel 20,000 



Pelagic Cormorant 150 



Black Oyster-catcher 4 



Total 24,991 



The following is a list of land-birds breeding on the island, with estimated 

 number of pairs: 



Pairs 



Northern Bald Eagle 2 



Northwestern Crow 25 



Sooty Song Sparro\v 400 



Townsend Fox Sparrow 100 



Western Winter Wren 10 



Chestnut-backed Chickadee 25 



Dwarf Hermit Thrush 40 



Varied Thrush 20 



Total 622 



The following migrants were noted on the island or on the ocean within a 

 mile of the island : 



Gavia immer, Loon; Synthiliboramphus antiquus, Ancient Murrelet; Bra- 

 chyramphus marmoratus, Marbled Murrelet; Rissa tridactyla pollicaris, Pacific 

 Kittiwake; Larus Philadelphia, Bonaparte Gull; Puffinns griseus, Sooty 

 Shearwater; Harclda hyemalis, Old Squaw; Histrionicus histrionicus, Harlequin 



