EXPLANATION 



In the foregoing list, the number accompanying each title is the 

 number assigned to the species in the American Ornithologists' Unioa 

 Check-List of North American Birds. The length of a bird is the distance 

 from the tip of the bill to the end of the tail, as it lies on its back. Resident 

 birds are those which remain with us during all seasons of the year, or which 

 cave representatives thus observable. Migrants are those which pass 

 northward in the spring and southward in the fall. Summer residents are 

 those which appear here in the spring, rear their young, and disappear in 

 the fall. Winter residents appear in the fall, remain during the winter, 

 and disappear in the spring. Winter visitors are such as are seen only ir- 

 regularly in the winter. 



A REVIEW 



An examination of the foregoing list shows that the following species 

 may be classed as residents: Richardson's grouse, gray ruffed grouse, 

 Columbian sharp-tailed grouse, sage grouse, ferruginous rough-leg, golden 

 eagle, bald eagle, long-eared owl, short-eared owl, barred owl, Rocky Moun- 

 tain screech owl, western horned owl, burrowing owl, Rocky Mountain 

 hairy woodpecker, Batchelder's woodpecker, red-naped sapsucker, desert 

 horned lark, American magpie, black-headed jay, Rocky Mountain jay, 

 American raven, Clarke's nutcracker, Rocky Mountain creeper, Rocky 

 Mountan nuthatch, red-breasted nuthatch, pygmy nuthatch, long-tailed 

 chickadee, mountain chickadee, bob-white, house sparrow 30 species. 



Summer residents are as follows: American eared grebe, pied-billed 

 grebe, American merganser, hooded merganser, mallard, gadwall, bald- 

 pate, green-winged teal, blue-winged teal, American golden-eye, Canada 

 goose, American bittern, sora, American coot, American avocet, Bartramiau 

 sandpiper, spotted sandpiper, long-billed curlew, killdeer, mountain plover, 

 mourning dove, marsh hawk, sharp-shinned hawk, Cooper's hawk, Ameri- 

 can goshawk, western red-tail, Swainson's hawk, duck hawk, pigeon hawk, 

 Richardson's merlin, American sparrow hawk, American osprey, belted king- 

 fisher, red-headed woodpecker, Lewis's woodpecker, northern flicker, red' 

 shafted flicker, poor-will, western nighthawk, kingbird, Arkansas kingbird, 

 Say's phoebe, western wood pewee, Train's flycatcher, American crow, 

 bobolink, cowbird, yellow-headed blackbird, red-winged blackbird, western 

 meadowlark, Bullock's oriole, Brewer's blackbird, bronzed grackle, Ameri- 

 can goldfinch, pine siskin, chestnut-collared longspur, McCown's longspur, 

 western vesper sparrow, western savanna sparrow, western grasshopper 

 sparrow, western lark sparrow, western chipping sparrow, clay-colored 

 sparrow, Brewer's sparrow, Montana junco, mountain song sparrow, arctic 

 towhee, black-headed grosbeak, lazuli bunting, Louisiana tanager, cliff 

 swallow, barn swallow, tree wallow, bank swallow, cedar waxwing, white- 

 rumped shrike, red-eyed vireo, warbling vireo, yellow warbler, Audubon's 



