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Breeding season timing and breeding success of Tufted Duck were studied on three lakes in the years 1987-1989. Clutch laying began in mid May, earliest in a Black-headed Gull colony, and continued to the first days of July. Clutch size ranged between 3 and 18 eggs ( x = 9.3, SD = 2.8, n = 331) and did not differ significantly between lakes and years. There was a significant reduction in clutch size...
The height, chosen tree species and location of 1316 Magpie nests in 11 towns and 6 farmland plots were examined in 1992. t-tests revealed a difference significant at p < 0.001 for the heights at which nests were located, with those in urban areas (x̅ = 13.2m, SD = 3.7, N = 513) being higher than those in suburban areas (x̅ = 11.3, SD = 4.1, N = 232), those in villages (x̅ = 9.6, SD = 3.7, N =...
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