Ecology of the Nesting-Site 115 
just. northeast of the Main Subdivision. One of these eggs 
hatched July 4, the other two, though fertile, failed to hatch. 
Extensive data were collected concerning ealls, song and 
breeding reactions but space does not permit their inclusion 
here. There were two or three pairs of these interesting birds 
in the vicinity and it is possible that one pair may have nested 
on the Main Subdivision. The musical calls of these birds to- 
gether with their uncanny song provided an atmosphere well in 
keeping with the open areas where the Prairie Horned Lark 
was also at home. The nesting habitat was that of comparatively 
tall, close-set, uniform timothy. 
Actitis macularia. Spotted Sandpiper. Arrived April 30, 
1926, but did not appear on the subdivision until May 22. A 
puddle there then, formed by late May rains, proved an attrac- 
tion for several days. A pair nested in block No. 19 not ten 
feet from the sparrow trap that I visited daily. The nest was 
found June 6 (first day of incubation, I believe), the eggs 
hatched June 25: an incubation period of twenty days. These 
young, with their parent, remained on or near the subdivision 
until July 17. 
The nesting habitat was in sparse but coarse weeds such as 
evening primrose (Oenothera biennis), white sweet clover 
(Melilotus alba), Mare’s tail (Hippuris vulgaris), wild lettuce 
(Lactuca sp.) and squirrel tail grass or wild barley (Hordeum 
jubatum). 
Oxyechus vociferous vociferous. Killdeer. The Killdeer came 
March 19 and was a conspicuous element in the bird life of the 
subdivision from that date to late July. Though they were 
there daily none actually bred on the Main Subdivision but 
rather seemed to use it as a feeding ground. However one nest 
was located on the West Subdivision, July 6; subsequently de- 
stroyed by a mower, July 15. It was located in the old vegetable 
garden, in an area of bare ground with sparse young weeds, such 
as Chenopodium, Xanthium and Setaria, beside a small plant of 
wild lettuce (Lactuca canadensis). 
Dolichonyx oryzivorus. Bobolink. Came on May 8, 1926. 
One was taken in my sparrow trap on May 14. On May 16 
they were present in numbers and in riotous song and from that 
time on formed the most conspicuous living element of the 
subdivisions. A second was taken in the trap May 21, the first 
