Curr. Biol. doi:10.1016/j.cub.2008.06.067 (2008)

When it comes to choosing a mate, male Atlantic molly fish (Poecilia mexicana) often have to make their selection when other males are watching. Martin Plath at the University of Potsdam in Germany and his colleagues suggest that, in this situation, males try to deceive others about their true intentions regarding mate choice.

When given their choice of a small or large female, males without an audience usually made advances to the bigger one. When another male was present, however, the molly initially paid attention to the smaller female but then stopped expressing a mating preference.

Plath hypothesizes that the behaviour is a counteradaptation to male mate-choice copying, in which males try to mate with a female that others also pursued.

说是某种鱼，雄的经常在有别的雄的鱼看着的时候选择配偶，而且这时候雄鱼还会骗别的雄鱼自己的择偶倾向。于是研究人员就猜测，这种行为是雄性为了防止别人和他选择一样的配偶，因为雄性会试图追逐有其他雄性追求的雌性。

不知道人是不是也会这样:P