DELAWARE VALLEY ORNITHOLOGICAL CLUB. 19 



Swarthmore roost, moved several times in and near the town. 

 Occupied for thirty years. Trees, deciduous and coniferous, 

 of low and high growth. Used as nesting colony in spring. 

 Largest number of birds recorded in fall, about five thousand. 

 Most of birds left last week of October, 1912. A few seen up 

 to December 15. Other species roosting, Robins and Cowbirds. 



Kirkbride roost, situated in mixed growth at Kirkbride's 

 Asylum, 46th and Market Sts., Phila. Used as nesting colonj^ 

 in spring. Occupied by birds in fall to number of one thou- 

 san^J. Roost deserted some time in August. Other species 

 roosting. Red-wings, Starlings, Cowbirds. 



North Woodbury roost, situated in grove of Sweet Gum trees 

 one acre in extent, in outskirts of town. Occupied by birds 

 till about October 1st. Then moved about one mile north. 

 Located in tract of woodland forty acres in extent, composed 

 almost entirely of scrub oak, only a few tall trees. No traces of 

 nests. Said to have been used at least six years. Birds left 

 for south last week in October. Other species occupying roost, 

 Robins and Starlings. Robins came to roost independent of 

 Grackles; Starlings came in associated with them. The Robins 

 remained in the old roost after the Grackles had removed to 

 the new, but the Starlings accompanied the Grackles and appar- 

 ently deserted the new roost at the same time the Grackles did, 

 a possible clue to the rapid spread of the Starling southward. 



Audubon roost. Very little data. Birds occupied tall trees 

 in and about the town to extent of about one thousand. Strange 

 to say this roost was located within one mile of the line of flight, 

 which passed from Collingswood to North Woodbury, yet at no 

 time were birds observed to fly in direction of Audubon. 



Summing up the foregoing, any kind of growths, whether 

 high or low, are satisfactory for roosting purposes. Grackles 

 appear to occupy the same roost year after year. When the trees, 

 in which the roost is located are removed, the roost is then 

 stationed at some favorable point in the neighborhood. Perse- 

 cution of birds, other than destruction of trees, does not appear 

 to affect roost stability. The main lines of flight come to each 

 roost from the same general direction, but the direction varies 

 greatly in different roosts. The number of birds occupying the 



