这些鸟类，比如小草原榛鸡，由于农民把草原变成玉米田以满足生物燃料的需求而受到危险。

These birds, such as the lesser prairie chicken, are threatened by farmers converting grasslands into corn fields to meet demand for biofuels.

矿业公司被告知好生款待附近的艾草榛鸡等动物。否则，如果动物因数量减至濒危规定线以下而入册，公司的日子将不好过。

Knowing that they will suffer if species decline to the point where they must be listed as threatened, mining companies are learning to tread softly around creatures such as the sage grouse.