先锋植物种子的增加和被猎杀动物的系统性变化是环境退化的证据。

Increases in seeds from pioneer plants and systematic changes in the animals hunted are evidence of environmental degradation.

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先锋植物种子的增加，被猎杀的动物以及用于建筑和燃料的树木系统的变化是环境退化的证据。

Increases in seeds from pioneer plants and systematic changes in the animals hunted and the trees used for construction and fuel are evidence of environmental degradation.

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根据史密森国家动物园，尽管狐猴有时被捕捉并当作宠物交易，促使其数量减少的主要因素还是森林退化。

Deforestation is driving their decline, although they are also sometimes trapped and sold as pets, according to the Smithsonian's National Zoo.

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