. Breeding birds of Ontario : nidiology and distribution. Birds; Birds; Birds. Mourning Warbler, Oporornis Philadelphia (Wilson) Nidiology RECORDS 34 nests representing 20 provincial regions. Breeds in mixed (7 nests), deciduous (2 nests), coniferous (1 nest), and unspecified (10 nests) woods, all with a dense understory. Either these wooded areas were open, or nests were at wood edges (Fig. 177), in clearings, or near roadsides. Three nests were in a brushy thicket, an alder swale, and a deciduous scrub (alder/willow/dogwood), respectively; 2 were in residential gardens; and 1 in a burn. Seve
. Breeding birds of Ontario : nidiology and distribution. Birds; Birds; Birds. Mourning Warbler, Oporornis Philadelphia (Wilson) Nidiology RECORDS 34 nests representing 20 provincial regions. Breeds in mixed (7 nests), deciduous (2 nests), coniferous (1 nest), and unspecified (10 nests) woods, all with a dense understory. Either these wooded areas were open, or nests were at wood edges (Fig. 177), in clearings, or near roadsides. Three nests were in a brushy thicket, an alder swale, and a deciduous scrub (alder/willow/dogwood), respectively; 2 were in residential gardens; and 1 in a burn. Seven nests were reported to be in damp or swampy areas. Nests were positioned in or among plant stalks, raspberry canes, fern fronds, grasses, and garden flowers, and in hazel stems. One nest was in a brush pile and another was on a sedge clump. Most nest positions ranged from ground level (10 nests) to elevations up to 15 cm (6 inches) (9 nests); 2 nests were at heights of m (1 ft), 2 were at m (2 ft), and 1 was at m (3 ft). Nests were cups with loosely built exteriors of grasses, leaves, plant stalks and fibres, bark strips, rootlets, hair, and spider webs. Linings were of rootlets (usually black), animal hair, fine grasses, and tendrils. Seven nests had outside diameters ranging from 10 to 15 cm (4 to 6 inches), inside diameters from 4 to 5 cm ( to 2 inches), outside depths from 6 to 13 cm ( to inches), and inside depths from to cm ( to inches). EGGS 29 nests with 1 to 5 eggs; IE (2N), 2E (3N), 3E (8N), 4E (12N), 5E (4N). Average clutch range 3 to 4 eggs (20 nests). Cowbird parasitism 30 nests with 3 parasitized (10%). INCUBATION PERIOD 1 nest, at least 11 days. EGG DATES 22 nests, 25 May to 20 July (28 dates); 11 nests, 14 June to 24 June. Breeding Distribution The Mourning Warbler (Fig. 178A) breeds across the province at least as far north as Big Trout Lake and Fort 183. Please note that these images are extracted from scanned pa
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