如果一条鱼要在两个群体中选择，加入较大的群体会更安全。
If a fish has a choice between two groups, it's safer to join the larger one.
许多种类的鱼可以根据它们的群体、它们的亲戚，甚至它们自己的卵来区分彼此。
Many kinds of fish can tell one from another, according to their group, their relatives, and even their own eggs.
食蚊鱼是淡水鱼，以蚊子幼虫为食，高度的群体化。
Mosquitofish, freshwater fish with a taste for mosquito larvae, are highly social.
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