Humpback whales in the Pacific like to winter in the south, near, say, the warm waters of Hawai’i. But this year, surveys in Hawai’i have turned up less a third of the number of humpback whales as in 2010, when the last survey was conducted. In addition, fewer of the pods had calves with them either. Whale experts don’t know why this year has been so strange, though some suspect that shifting ocean temperatures due to the strong El Niño may play a part.