Birds, mostly seagulls and resident geese populations, are often blamed - both rightly and wrongly- for the bacteria load measured at beaches. In addition to public outreach and education, beach managers across the country have tried numerous and various techniques to chase away these birds and to make their beaches less welcoming, including fencing, spikes, scarecrows and barking border collies.
The latest bird chasing invention haling from Wisconsin might be doing the job, but might not be welcomed everywhere by the beach-going public. See the Goosinator in action here.