Evidence for Evolution Trait correlates with preference In the paper I discuss here, the authors (Houde and Endler,1990) conduct experiments on the guppy Poecilia reticulata . They collected these fish from 7 different streams that harbor these species. Each stream differed in the color pattern of male fish residing there. Male guppies had orange coloring covering from between 5% to 17% of their body, depending on which stream they came from. They experimented by placing 6 males and 6 females in a tank and measuring the sexual attractiveness of the males. This was calculated as percentage of male displays that elicited a response from the female. In each separate experiment all the males were from one locale and all the females were from the same or another locale. They tested most, but not all, of the possible combinations of male/females. They found that, female guppies from streams where males had large amounts of orange coloring strongly prefered male guppies with large amounts of orange to males with less orange. In
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