Here is a handy guide to help you plan your Osprey Deterrent efforts. The best time to install your OFF-Sprey Raptor Deterrent is before they return from migration between September and February. Remember, if you have nests that are occupied with either eggs or fledglings, you can NOT disturb them without going through your local or state wildlife agency. If you break eggs, injure or kill the young Ospreys, you can be fined through the U.S. Migratory Bird Treaty Act. Since the Ospreys migrate back to the same nesting spots year after year, once they leave the nest, or if you see them beginning to build the nests you should install your “OFF”-Sprey Raptor Deterrent.