Long Island’s last commercial duck farm is rebuilding after a bird flu outbreak forced the destruction of its entire 100,000-bird flock in January. The first wave of more than 900 young ducks arrived at Crescent Duck Farm in Aquebogue at the end of May. More arrived this month and others will arrive later. They were raised at a nearby farm while the original site was thoroughly sanitized. Crescent Duck Farm owner Doug Corwin said the ducklings hatched from eggs that health officials allowed it to preserve from the outbreak. Long Island was once a center of U.S. duck production with more than 100 farms.