Who's got the biggest set of them all?

ScienceDaily (2010-11-10) -- Researchers believe they have found which species has the largest testicles in relation to body weight on the planet -- and why. One of the researchers said, "We couldn't believe the size of these organs, they seemed to fill the entire abdomen." Researchers were surprised that the Tuberous bushcricket did not produce more sperm: in fact they produced less voluminous ejaculates.

http://www.sciencedaily.com/releases/2010/11/101109191752.htm#