He used the plane to make aerial surveys of the Kalahari's wildlife, and he and Delia conducted close observation of the social life of hyenas, learning about their surprisingly communal behavior.

他驾驶这架飞机对卡拉·哈里的野生动物进行空中飞行调查，同时他和迪丽娅还对鬣狗的群体生活进行了近距离观察以便了解它们令人惊奇的集群行为。

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Reading up on the behavior of trees - a topic he learned little about in forestry school - he found that, in nature, trees operate less like individuals and more as communal beings.

阅读和研究树木的行为——这个话题他在林业学校中学习得甚少——他发现，在自然界，树木更多时候不是以个体形式生活，而是像社群一样。

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