54 



MEMOIRS OF THE NUTTALL ORNITHOLOGICAL CLUB. 



STATUS OF OCCURRENCE. 



In the following lists the birds of the Cambridge Region have been grouped 

 in classes to show, as nearly as possible, the character or status of their occur- 

 rence at the present time. These classes include : — 



Permanent residents.^ 

 Summer residents. 

 Winter residents. 

 Spring and autumn migrants. 

 Autumn migrants. 



Occasional or accidental visitors. 



Introduced species. 



Extinct species. 



Expunged or doubtful species 



s. r. equals summer resident ; w. r., winter resident ; s. m., spring migrant. 

 Any of these signs following a name indicates that the bird in question has 

 also more or less claim to be included in the class thus referred to, as well as in 

 that in which it is named. 



Permanent Residents. 



Bob-white. 

 Ruffed Grouse. 

 Red-shouldered Hawk. 

 American Sparrow Hawk. 

 American Long-eared Owl. 

 Barred Owl. 

 Screech Owl. 

 Downy Woodpecker. 

 Northern Flicker. 

 Blue Jay. 



American Crow. 

 Meadowlark. 

 Purple Finch. 

 American Crossbill. 

 American Goldfinch. 

 Cedar Waxwing. 

 White-breasted Nuthatch. 

 Chickadee. 

 American Robin. 



' This includes species which, although not always continuously present throughout the year, may 

 occur at any season. 



