Bower building techniques increase the chance of reproduction.
In biology, a fitness advantage refers to behavior or phenotypical trait that helps an organism to be fit or to have greater chances of survival and reproduction.
In the case of the species Chlamydera nuchalis, bower building is a fitness advantage because males with bower building abilities have a greater change of reproduction, while those with poor bower building abilities are not likely to reproduction, and therefore not likely to pass their genes to the next generation.
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