All the land tortoise species formed a tight cluster of points in the upper part of the triangle; all the water turtles cluster in the lower part of the triangular graph.

所有陆龟品种都在三角形的上部形成一个紧密的点群；所有的水龟都聚集在三角图的下方。

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Mr. Henen, who has a doctorate in biology, is part of a little-known army of biologists and other scientists who manage the Mojave desert tortoise and about 420 other threatened and endangered species on about 28 million acres of federally managed military land.

WSJ: An Army of Biologists Are on Nature Patrol at Military Bases