About five or so years ago they killed about 10,000 of them using .22 short sub sonic rounds. I heard this from a guy who was involved with the plan. It was allowed by some agency of the government. They picked them up and disposed of the birds in some landfill. I do not know what happened after that but they are really bad animals. They are all around Florida and come up to a fishing boat waiting to eat any small fish you release. Last year there were two of them hanging around our chartered boat and they must have eaten at least 10 smaller sea trout in an hour.