Not keen on them either, but they ARE native. I'm wondering if their resurgence may be due to zebra mussels. As far as I know, cormorants are sight feeders, swimming with their eyes open. Anyone who remembers the state of the Great Lakes, and many others, in the 60s, before detergent phosphates were reduced, will understand that there is no way they could have seen anything in that water. Once it cleared up, the way was also clear for their return, and zebra mussels cleared it even more.