Populations of the rare marine mammals, with their big, round eyes and prominent whiskers, had dwindled so dramatically that the species at one point faced extinction. But now thanks to conservation efforts they are enjoying a remarkable comeback. Nearly half of their estimated global population of 800 live in Greek waters. (AP Video by Thanassis Stavrakis, Elena Becatoros. Production by Thanassis Stavrakis, Elena Becatoros, Theodora Tongas)