One sunny July morning on the Neotropical island of Trinidad, a group of caterpillars, hundreds strong, marched in head-to-tail procession up their host tree. Among them were two morphs: the majority, long-haired and black, and in smaller numbers, a more cryptic short-haired brown morph. Both proceeded up the tree trunk, thoroughly integrated, and indistinguishable from each other in their behavior. At the bifurcations of branches they split into smaller processions, and continued to the very tips of the branches.

中文翻译：

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一个物种领先，另一个跟随：热带毛虫的种间游行

七月一个阳光明媚的早晨，在特立尼达的新热带岛屿上，一群毛毛虫，数百只强壮的毛毛虫，头尾相接地沿着它们的宿主树前进。其中有两种变种：大多数是长毛和黑色，少数是一种更神秘的棕色短毛变种。两个人都沿着树干向上走，完全融合在一起，在他们的行为上彼此没有区别。在树枝的分叉处，他们分成更小的队伍，并一直延伸到树枝的顶端。