FAIRBANKS, Alaska, Dec. 12 (UPI) -- Veterinarians in Alaska say they don't know what has killed almost 200 arctic ringed seals since July, with similar deaths reported in Canada and Russia.
The mystery ailment causes the animals' hair to fall out and ulcers to develop on their skin and flippers, and necropsies have revealed lesions on their lungs, livers, hearts and brains, NewScientist.com reported Saturday.