NCBI Bookshelf. Charles Darwin laid the foundation for all modern work on sexual selection in his seminal book The Descent of Man, and Selection in Relation to Sex. In this work, Darwin fleshed out the mechanism of sexual selection, a hypothesis that he had proposed in The Origin of Species. He went well beyond a simple description of the phenomenon by providing extensive evidence and considering the far-reaching implications of the idea. Here we consider the contributions of Darwin to sexual selection with a particular eye on how far we have progressed in the last years. We focus on 2 key questions in sexual selection.
BBC - Earth - Why have animals evolved a sense of beauty?
Evolution is supposed to be a ruthless process that forces animals to survive at all costs, so why did an appreciation for beauty evolve? There are many things I consider beautiful. I like a colourful dance, a haunting song or an intriguing face. But I couldn't always consciously tell you why. Peacock spiders are much the same. The males have beautiful rainbow-coloured abdomens, which they show off by performing some serious dance moves.
Metrics details. Sexual selection occurs when animals of one sex compete to mate with members of the other. Members of one sex usually males may fight each other for the privilege of mating with members of the other, as in deer or sea lions.
Verified by Psychology Today. Animal Emotions. There are no free lunches in the sexual marketplace. Regardless of how traits and preferences evolve, they incur costs as well as reap benefits.