The park rangers at Grand Canyon National Park have had enough. In recent years, the Arizona park has seen a surge in the number of people attaching padlocks to its fences as a romantic gesture. These love locks have to be periodically removed, as they clutter the area and are “effectively vandalizing and littering and ultimately damaging public lands,” says Jeff Stebbins, a spokesman for the park. The locks also pose risks to animals, especially when visitors toss the keys into the canyon; experts worry that endangered birds such as California condors might ingest them and die. In October, park officials took to Facebook to request visitors stop participating in the custom. Love locks are also trendy in other parts of the world—including France and Italy—and many cities have ordered their removal from bridges, worried that the extra weight will cause structural problems. Grand Canyon rangers hope that people will be more responsible once they’re aware of the consequences. “Do your part to not contribute to these bad habits,” they wrote online, “and inform others of what can happen to the wildlife if these behaviors continue.”