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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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Animal Sex: News and Features

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The sex lives of animals: A rough guide | New Scientist

From an evolutionary and biological perspective, animals are driven to have sex in order to procreate. But there is a lot more to sexual relations between animals. Animal sex is at least as strange and varied as human sex. A male might copulate with many females. And female animals of many species can be choosy, too. Homosexuality is common.
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Fourteen Fun Facts About Love and Sex in the Animal Kingdom

By Michael Marshall. The urge to reproduce, to pass on our genes to a new generation, is one of the most powerful in our lives. This is equally true of the bewildering variety of animals with whom we share the planet.
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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.
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