Pack-ice killer whales are highly social creatures ... Typically, kilowatts are quiet when they're searching for prey because sound travels incredibly well in water. And so they could alert ...

New research finds some baleen whale species call at such deep frequencies that they're completely undetectable by killer whales, which cannot hear sounds below 100 hertz. These also tend to be the ...

Some baleen whales avoid killer whale attacks by singing songs at deep frequencies that their predators cannot hear.