Males compete all the way to sperm shape

Sexual competition may drive the proteins that make up mammalian sperm

By Bethany Brookshire, 17:07 PM April 9, 2014

Rams glare, charge and lock horns. Frogs chorus in a deafening battle of the bands. Two walrus tangle in a multi-ton weight war. There are examples of males fighting over females throughout the animal kingdom. This sexual selection is often dramatic, violent and can even be a matter of life or death.

But sexual competition doesn’t end when boy gets girl. It persists down to the microscopic level, as sperm race for the egg. And a new study shows that competition influences the smallest parts of...

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