Thank the Feds, we have them here in the western basin of Lake Erie and Michigan. They will literally strip a small island of all vegetation from roosting and feces. Go look at Little sister island lake Erie, stripped. Here is an interesting article where the feds are involved in the cormorant control.. http://michiganradio.org/post/judge-rules-federal-agency-overstepped-its-bounds-cormorant-control