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. These traits have evolved to enhance an animal's chance of attracting a mate, rather than to enhance survival ability. A weighty, colourful tail is a hindrance if you're trying to evade a predator.offspring –- often only sperm -– is much less substantial than the effort a female puts in, producing eggs , pregnancy and probably raising the offspring.
Historically, scientists focused on the interactions between males and often ignored the way females shaped evolution. But now researchers are paying more attention to the fascinating effects of female agency. Alternatively, animals that have a hindersome trait, yet still survive, are probably of high genetic quality. There are also sensory bias theories, where mating preferences are a by-product of natural selection of the senses.Yet, none of these theories explain why there is so much variation in traits of males of the same species, or why female preferences can vary over time or within a species.
of a population in which males mated with many females. The model involved males with two traits, with only two variants each .
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