The double-crested cormorants on Toronto islands are causing significant ecological damage, with their guano destroying trees and deterring visitors. Their population has surged to around 18,000, leading local residents to call for their relocation, which is complicated by legal protections against culling within city limits. The Toronto and Region Conservation Authority (TRCA) is actively managing the cormorants and attempting to encourage ground nesting, but efforts are challenging and often temporary. As their nesting habits continue to impact the environment, the debate over their role in the ecosystem intensifies.
