Similar efforts have been attempted in other cities, some with roosts far larger than the one in Sunnyvale. Officials in Trenton, N.J., have employed lasers, pyrotechnics and spotlights to disperse some 20,000 crows that settle downtown each winter, NJ.com reported. In 2014, Penn State University employed a combination of lasers and loud fireworks, attempting to displace the roughly 3,000 crows that roost on campus, though the birds continue to come back, StateCollege.com reported.
