Human Attraction in Animals

So I read carl4266's blog , wich explained research that claimed that there is a deep biological need for human attraction. As our textbook has pounded into our heads, research needs to be replicated if were are to accept its claims. In my opinion, a good way to support an evolutionary/biological view is through animal research, because animals are more inclined to only follow their basic reproductive instincts than humans, almost creating a control on variables involving human personal preference. A study conducted by the University of Minnesota, on lion manes, provided very similar results as the one on human attraction. Female lions clearly prefer males with darker manes, opposed to those with lighter ones. A darker mane indicates more testosterone in a male lion--much like a more masculine face in a male human--than a lighter mane. These findings demonstrated that certain, more attractive, physical features conveyed the presence of good genes and fertility--much like a symmetrical face to humans--giving more support to the claim that much of attraction is biologically rooted in the need to pass on the most desirable genes to a lions, or humans, offspring.