Lone whales shout to overcome noise

ScienceDaily (2010-07-07) -- Just like people in a bar or other noisy location, North American right whales increase the volume of their calls as environmental noise increases; and just like humans, at a certain point, it may become too costly to continue to shout, according to marine and acoustic scientists.
http://www.sciencedaily.com/releases/2010/07/100706204713.htm