Consequently, it is in the interest of females to be more picky about their mating partners. This is known as anisogamy and usually causes males to compete for females through the evolution of weapons such as antlers in deer, or adornments such as the beautiful tail of the peacock. Throughout most of the animal kingdom, females have a finite number of eggs, whereas males have an infinite number of sperm. To understand why some species evolved special traits or appearances you need to know why the males and females of many species evolved to look so different to one another. Yet research is revealing more about animals that defy expectations when it comes to sex norms. Most people know that male seahorses become pregnant and give birth.
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