An early scientists of evolution theorized that the way an animal or plant looks gives it a fighting chance to stay in the reproductive pool. When an animal begins puberty (including humans), they begin to develop what are called secondary sex characteristics. Primary characteristics are obvious: either a penis or a vagina. Secondary characteristics include a change in shape, color, and ornamentation.
- Shape – most species begin to show more muscle definition especially in males. Female take on a more curvatious form and develop breasts.
- Color – Male birds begin to take the color of other males of their species. For example, the male cardinal is red and the female is a brown color.
- Ornamentation – this refers to things such as antlers/horns in deer and pubic hair in humans.
These characteristics are signs of fertility, which lets members of the opposite sex know the animal is ready to mate; thus the dance of courtship and mating begins.
The Dance of Love
Even though in many species of animals males and females tend to resemble each other physically, there is some kind of showing off involved. Let’s think about birds as an example again. Male peacocks put on an elaborate display with their feathers to attract females to them. Some male birds will build a nest and take a potential female to inspect it before she agrees to mate with him. Can you think of some things human males have done to attract you to them?
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