Male Madagascar hissing cockroaches battle one another, but those with smaller horns may not be at a total disadvantage.
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Not only are they capable of surviving under extreme conditions, but roaches may have a way to help ensure their propagation as well. New research shows that male Madagascar hissing cockroaches with smaller horns—which they use in battle over females—compensate with larger testicles that may help them fertilize females.
Read all the “Gory Details” of how these cockroaches can become lovers or fighters, but not both.
http://news.nationalgeographic.com/2016/11/gory-details-hissing-cockroach-testicles-evolution/
Cockroach vs. Cockroach: Watch How These Insects Fight For Love | National Geographic
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