"In the Nahant/Lynn waters, just north of Boston, we not only have the traditional seagulls and cormorants which inhabit the area, but we are on one of the North American flyways for terns. They visit us in early June heading north and mid to late August through mid September heading south. They love to sit, using their claws (for want of a better term) on the bow and stern rails facing into the wind. Unfortunately, they leave a mess. After hours of scrubbing and creative attempts to ward them off, I found that a clip and wire tie is simple and 100-percent affective if enough are used."