We present the results of the biometrical analysis made on a sample of 17 juvenile rooks, Corvus frugilegus (L.), captured in the city of Iaşi, during the emancipation period, between 11 th of May 2010 and 5 th of June 2010. Thirteen of these birds came from a nesting area situated in the northern part of the city, along the Boulevard Carol 1 st , between the buildings of Romanian Academy, Iaşi Branch and the Super Copou Store, where old trees are predominant. The rest of four individuals were captured from two poplar plantations, located in southeastern part of the city. Willing to gather metrical and weight related data, we captured 16 European jackdaw chicks, Corvus monedula (L.) from Tătăraşi, the neighborhood situated in the eastern part of the city of Iaşi, between 26 th of May 2010 and 30 th of the same month. This species usually build their nests inside the ventilation holes of the apartment houses. We choose to study Corvus frugilegus and Corvus monedula species together because the last one joins the first when looking for food, defending from predators and night aggregation.