To support our nonprofit science journalism, please make a tax-deductible gift today. Sex chromosomes influence physical differences between male and female animals, such as feather patterns in mandarin ducks. In most animals, sex chromosomes help determine whether an individual develops as a male or female. Sexes of some animals, such as most male arachnids, lack a second sex chromosome entirely. These chromosomes contribute to the physical differences between males and females.
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Love is a universal language that is unique to each species. While we humans may love cuddles and constant attention, love translates differently with other animals. This is mostly the case with sexual intercourse during mating seasons. To show you how different each species interacts and reproduce, here are some animal sex facts that will surprise you. The fins of the male will eventually melt away.
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Dating apps have reduced the ritual of human coupling down to a swipe. Creatures of all sorts have evolved some pretty spectacular strategies to woo their mates and ensure their genes carry on. Here are just a few examples of extreme courtship and copulation that put us tech-savvy humans to shame. Like humans, giraffes undergo cycles of fertility.