In this Dec. 31, 2010 photo provided by New Zealand Department of Conservation, a rare female spade-toothed beaked whale lays dead on Opape Beach, in New Zealand. The spade-toothed beaked whale is so rare, nobody has seen one alive. But scientists are sure it exists. Researchers from New Zealand and the United States describe the discovery in a paper published Tuesday, Nov. 6, 2012, in the journal &quot;Current Biology.&quot; They say it&#039;s the first time scientists are able to describe the world&#039;s &quot;rarest and perhaps most enigmatic&quot; marine mammal. (AP Photo/ New Zealand Department of Conservation) EDITORIAL USE ONLY