Henderson— On Northeastern Colorado Birds. 109 



small pines and cedars, the gulch beds in many places covered 

 with dwarf chokecherry trees, rose bushes and other shrub- 

 bery. Throughout the irrigated section we had seen numerous 

 Kingbirds [T. fynviniis) and Say Phoebes, but these had 

 been left behind' Throughout the bluff region there were 

 great numbers of Arkansas Kingbirds, but not one of the 

 other members of the family did. we see there. Early the first 

 morning in camp we were delighted to hear the Mockingbird 

 which we had missed up to that time during the whole journey 

 of 150 miles. They were abundant all along the bluffs and 

 often gave us moonlight matinees in addition to the daylight 

 concerts. White-rumped Shrikes were resting in the gullies. 

 In this region, however, the birds of transcendent interest 

 were the hawks and White-throated Swifts. On every inac- 

 cessible pinnacle on ledge of rock we were sure to see a nest 

 of some species of hawk. On one occasion a member of the 

 party was let down from the top of a cliff to a ledge, from 

 v/hich three young hawks were hoisted to the rocks above, 

 photographed and then restored to their nest. Here we had our 

 first and only experience with White-throated Swifts, wdiich 

 nest in holes in the rocks in such situations that we did not 

 succeed in reaching them in a single instance, though we could 

 at almost any time see them flitting to and fro. Clinging to the 

 walls in many places were the mud habitations of Cliff Swal- 

 lows, which, unlike the Swifts, nested within easy reach. Tur- 

 key Vultures, which were once abundant throughout the region 

 traversed by us, were seen ou this trip only on one or two oc- 

 casions, a pair being constantly in sight of our camp at the Da- 

 vis Ranch, ten miles east of Grover. 



As we drove down Crow Creek, we noticed ahead numbers 

 of Great Blue Herons passing each other, some headed south- 

 westward, others northeastward. This is a familiar sight every 

 summer among the big cottonwoods on the St. Vrain. Big 

 Thompson and other streams where water is abundant, but 

 was somewhat surprising miles from running water. Never 

 did we expect to see a hercnry in such a place, }'et in a few 

 moments the trees, in the dry channel of Crow Creek, came in 

 sight, every tree bearing several heron nests, all containing 

 young birds waiting the results of parental fishing excursions 



