A study by Dutch utility Nuon provides further evidence to refute the still common allegation that wind turbines are bird killers. According to a study by specialist research agencies Bureau Waardenburg and Alterra on behalf of Nuon, a 1.5 MW turbine causes an average 28 bird deaths per year in comparison with the 18 per year killed by a 300 kW turbine, while delivering five to ten times as much electricity. Dutch bird protection society Vogelbescherming Nederland declares itself "pleasantly surprised" by the finding. According to Nuon, the study shows that the Netherlands' 1700 wind turbines are likely to be responsible for some 50,000 bird deaths in comparison with some two million which are killed each year on Dutch roads. "We hadn't expected this result," says a Vogelbescherming spokesman. "We are very happy with it as we are pro-wind energy in principle." The organisation will continue to monitor the siting of new wind farms. "Naturally they shouldn't be built in the line of migration and for that reason we continue to oppose the construction of a wind farm on the Afsluitdijk," he says. The Afsluitdijk dam separates the waters of the IJsselmeer sea from the Wadden Sea.