1 2 



Wild Birds 



EXPERIMENTS IN THE USE OF THE OIJSERVATION TENT AND IN CHANGE OF NESTING 



SITE. 



liiKiis AND Nests. 



4 

 5 

 6 



7 

 8 



9 



lO 



1 1 



] 2 



13 

 14 



15 

 16 



t8 



20 

 2 1 



22 



24 



25 



26 



Redwing Blackbird (Nest undisturbed) 



Redwing Blackbird (Nest swayed down one foot). 



Catbird (Nest undisturbed) 



Catbird (Position of nest unchanged) 



Catbird (Nesting bough displaced ten feet) 



Catbird (Nest undisturbed) 



Cedar-tiird (Nesting bush moved twenty feet) 



Cedar-bird (Nesting bough displaced forty feet).. 

 Cedar-bird(Nestingboughcutoffandmoved fifty feet). 

 Cedar-bird (Nest in ]une tree ; bough moved fifty feet). 

 Red-eyed Vireo (Nesting twig lowered one foot). . . . 

 Red-eyed Vireo (Nesting tree cut down and taken 



from woods forty feet to open) 



Robin (Nesting bough cut off and moved thirty feet). 

 Robin (Nest in oak thirty feet up ; branch moved to 



open field sixty feet away) 



Bluebird (Nest-hole in apple tree ; moved fifty feet tO| 



open field 



Chestnut-sided Warbler (Bushes cleared in front of 



nest) 



Chestnut-sided Warbler (Bushes cleared in front of 



nest) 



Night Hawk (Nesting site with young enclosed with 



wattled twigs) 



Baltimore C>riole (Nesting branch in apple tree ; 



moved t\venty-five feet) 



Kingbird (Nesting branch moved twenty feet) 



Kingbird (Nesting branch moved twenty-five feet).. . 

 Wilson's Thrush (Nest in tussock ; whole moved from 



swamp to open fifty feet) 



Chipping Sparrow (Nesting bough moved twenty feet) 

 Brown Thrush (Nest in thornbush ; movedfifteen feet). 

 Song Sparrow (Nest in dead sapling ; moved forty feet 



to open) 



Kingfislier (Nest in bank ; opened at rear) 



July 

 July 

 luly 

 July 

 Aug. 

 June 

 Aug. 

 Aug. 

 Aug. 

 July 

 Aug. 



July 



Aug. 



14, 

 19, 

 23, 

 26, 



4, 

 21, 



3, 

 21, 



23, 



14, 



3, 



S> 

 9. 



July 25, 



Aug. rs, 



June IS, 



June 28, 



June 29, 



June 25, 

 July 2, 

 July 2, 



July 9, 

 July II, 

 July 1 1 , 



Jul}' i7> 

 July 23, 



899 

 900 

 899 

 899 

 899 

 900 

 899 

 899 



899 

 900 

 899 



900 

 899 



900 



899 



goo 



900 



900 



900 

 900 

 900 



900 

 900 

 900 



900 

 900 



Number 



OF j 



Young, i 



Age 



OF 



Young, 



3 

 3 

 4 

 4 

 4 

 2 



4 

 2 



4 

 3 



3 



4 



4 eggs 



4 



1 1 days. 



5 days. 

 8 days. 



3-4 days. 

 7-8 days. 



7 days. 

 9-10 days. 



6 days. 

 10 days. 



7-8 da)'s. 



8 days. 



9 days. 



7 days. 



6 days. 

 5 days. 



4 days. 



5 days. 



8-9 days. 



6 days. 



7 days. 



10 days. 

 4-5 days. 



4 days. 



5 days. 

 9 days. 



In only three cases where the nest with its supports was moved did the young suffer, 

 and in each of these from unusual conditions. A nest of Cedar Waxwings (8) though fed 

 by both birds and brooded almost constantly, succumbed to the heat, the day being one 

 of the hardest of the entire summer. The second, a nest of Bluebirds (15), were constantly 

 fed during the day while I watched them, but the old birds were frightened off at some 

 later time, and tlieir young left to perish. The third, a nest of Song Sparrows (25), also 

 came to grief on account of the heat. The day was the hottest ever recorded by the 

 Weather Bureau in New England, and the nest, which was moved to the open, hap- 

 pened to be in the crotch of a dead sapling, so that the birds were exposed on all sides. 



