476 CoLORAco College Publication 



THE BIRDS OF EL PASO COUNTY, COLORADO. 



Colymbus nigricollis califomicus. Eared Grebe. "Hell 

 Diver." 



A regular migrant in spring and fall, arriving in spring 

 about May 1. The autumn migration begins in September and 

 continues for a couple of months, the latest date we have 

 being October 27, 1906. 



As there are not many bodies of water suitable for aquatic 

 birds in the County the opportunity for obtaining notes on 

 these forms has not been as good as might be desired, and 

 especiall3i has this been the case in the past. Various reser- 

 voirs have been constructed for irrigation purposes during the 

 last few years which are attracting more birds during migra- 

 tion. This explanation will account to some extent for the 

 paucity of notes orr this and the following species of aquatic 

 birds. 



The grebes would no doubt breed in the County if there 

 were any suitable places, as they breed in many localities in 

 Colorado. 



Li the early days of Colorado Springs there were a couple 

 of reservoirs on East Boulder Street, on ground now well 

 settled. It is interesting to note that Warren killed an Eared 

 Grebe on one of these reservoirs, October 23, 1882. 



Podilymbus podiceps. Pied-billed Grebe. "Hell Diver." 



A regular migrant, but not as common as the Eared 

 Grebe. 



Gavia immer. Loon. 



Rare migrant. Aiken has had several adults brought to 

 him, one of them in spring. It has been seen on Prospect 

 Lake. 



Gavia arctica. Black-throated Loon. 



A not uncommon migrant, mainly in autumn. All that 



