Since the last statewide rooftop nesting survey was completed in 1997-2000 (Gore et al. 2007), about a third of the roofs utilized by nesting shorebirds are no longer suitable for nesting. However, many more roofs have been colonized by shorebirds, and remain the primary nesting sites for Least Terns. Read more about this in the new report by Zambrano and Warraich: 2010 Statewide Roof Nesting Seabird and Shorebird Survey FINAL REPORT