NANTUCKET, Massachusetts — The National Oceanic and Atmospheric Administration says the third death of a rare North Atlantic right whale this year has been confirmed. NOAA and conservationists are keeping a close eye on the right whale population because of high mortality and low reproduction in recent years. The agency says a right whale carcass was found floating about 100 miles east of Nantucket on Sunday. NOAA says photographs of the animal show wounds consistent with entanglement.