. Breeding birds of Ontario : nidiology and distribution. Birds; Birds; Birds. Bobolink, Dolichonyx oryzivorus (Linnaeus) Nidiology RECORDS 140 nests representing 36 provincial regions. Breeds invariably in open field areas (Fig. 187): hay fields (41 nests); shrubby and weedy fields (41 nests); pastures (18 nests); low, marshy fields (14 nests); and a stubble field (1 nest). Nests were almost always on the ground (91 nests), but 2 were elevated to a height of 15 cm (6 inches) in supporting grass stems, and a third was 30 cm (12 inches) high in purple vetch. They were usually very well conceale
. Breeding birds of Ontario : nidiology and distribution. Birds; Birds; Birds. Bobolink, Dolichonyx oryzivorus (Linnaeus) Nidiology RECORDS 140 nests representing 36 provincial regions. Breeds invariably in open field areas (Fig. 187): hay fields (41 nests); shrubby and weedy fields (41 nests); pastures (18 nests); low, marshy fields (14 nests); and a stubble field (1 nest). Nests were almost always on the ground (91 nests), but 2 were elevated to a height of 15 cm (6 inches) in supporting grass stems, and a third was 30 cm (12 inches) high in purple vetch. They were usually very well concealed under grasses, weeds, and sometimes shrubs, and were woven into surrounding grass and plant stalks. Thirteen nests were noted to be in shallow depressions. Three unconcealed nests were reported. Nests were woven, shallow cups, and 1 nest was described as frail. Exteriors were composed of grasses, plant stalks and fibres, and rootlets. Linings were of fine grasses, and horse hair was reported in 1 nest. Outside diameters of 9 nests ranged from 9 to 11 cm ( to inches); inside diameters of 8 nests ranged from to cm ( to 3 inches); outside depths of 7 nests ranged from 4 to 5 cm ( to 2 inches); inside depths of 7 nests ranged from to 4 cm (1 to inches). EGGS 95 nests with 1 to 7 eggs; IE (IN), 2E (3N), 3E (2N), 4E (2IN), 5E (45N), 6E(22N),7E(1N). Average clutch range 4 to 6 eggs (88 nests). Cowbirdparasitism 136 nests with 8 parasitized (). INCUBATION PERIOD 1 nest, ca 11 days. EGG DATES 102 nests, 19 May to 16 July (107 dates); 51 nests, 2 June to 12 July. Breeding Distribution The Bobolink (Fig. 188A) breeds throughout southern Ontario, and in the north as far as Kenora and Kapuskasing, in areas where forests have been cleared. â i -. 249. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the ori
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