While not the biggest species of whale in the world, the Right Whale has the (dubious?) honor of being the animal with the largest testicles in the world. Each testicle weighs around 500kg (1,100lbs!). However, they're not only big in absolute size, the weight of the testicles is around 1% of their total body weight, which is relatively large compared to OTHER species. This suggests that sperm competition is important in the mating world of Right Whales. Talk about some big balls.
On a sad note, the reason they're called Right Whales, is because fishermen thought that they were the "Right" ones to hunt because they float when they're killed and swim within sight of shore.
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