Tree Sparrow (Passer montanus) Science Article 7
This study is based on the spring temperaturesand laying dates of first eggs of threepasserines (sedentary: Great Tit, Parus majorand Tree Sparrow, Passer montanus; migratory:Starling, Sturnus vulgaris). Laying datesof first eggs were used as estimates of timingof breeding. The term ‘laying date’ is definedas the date of laying of the first egg in a clutch.
Zdravko DOLENEC, Ardeola, 52(2), December 2005, 355-358