An article in Nature World New explains that “Humpback whale researchers listening to underwater recordings got a surprise upon hearing data collected in Antarctic waters over winter. It had been assumed that all humpbacks migrate to equatorial waters during the winter, but acoustic data from underwater recording stations along the ice shelf revealed the sounds of humpback whales even during the austral winter months.”
The entire article is available at
http://www.natureworldnews.com/articles/3885/20130909/humpback-whales-present-antartic-waters-over-winter-surprise-scientists.htm .