The Migration of North American feirds 



Compiled by Prof. W. W. Cooke, Chiefly from Data in the Biological Survey 



With a Drawing by Louis Agassiz Fuertes 

 (See Frontispiece) 



TUFTED TITMOUSE 



The Titmouse of the genus BcBolophus are among the best examples in the 

 United States of strictly non-migratory birds. Many, if not most, of the indi- 

 viduals of the Tufted Titmouse never go ten miles from the site of the nest 

 where they were hatched. A small per cent wander beyond the bounds of the 

 regular range, which extends from Florida, the Gulf Coast and eastern Texas 

 north to New Jersey, Pennsylvania, Ohio, Indiana, Illinois, Iowa, and 

 Nebraska, and these few have been found in southern Connecticut, Long 

 Island, and various other places in New York, even north to Rochester, in 

 southern Michigan and southern Wisconsin. It is not possible to determine 

 how much of this represents actual wandering, as distinguished from the 

 breeding of isolated pairs, somewhat, or even considerably, beyond the normal 

 limits of the species. 



BLACK-CRESTED TITMOUSE 



The principal home of the Black-crested Titmouse is in eastern Mexico in 

 northern Vera Cruz, Tamaulipas San Luis, Potosi, and Coahuila, but a few 

 individuals breed in the United States in the Lower Rio Grande Valley of 

 Texas. Most of the Texas birds belong to a subspecies, Sennett's Titmouse, 

 which occurs in central Texas from Tom Green and Concho counties east to 

 the Brazos River, and from Young County south to Nueces and Bee counties. 



PLAIN TITMOUSE 



The individuals of this species have been separated into three subspecies, 

 which together occupy most of the southwestern United States. The Gray 

 Titmouse (griseus) has the widest range from eastern New Mexico and the 

 eastern foothills of the Rocky Mountains of Colorado, west to the Sierra 

 Nevada Mountains of California and the desert ranges of the Colorado Valley. 

 The known range of this form has been recently extended by the taking of 

 specimens at Bridge, Idaho, August 13 and 17, 1910, and on the Green River 

 in Wyoming, near the southern boundary of the State, September 19, 191 1. 



The typical subspecies, the Plain Titmouse (inornatus), occupies California 

 west of the Sierra Nevada and from southern Oregon (Ashland) to northern 

 Lower California (San Pedro Martir Mountains). 



The Ashy Titmouse (cineraceus) is confined to the Cape Region of southern 

 Lower California. 



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